Persistent Disk performance overview

If your workload has specific performance requirements, then you must choose a virtual machine (VM) instance that can reach that level of performance because the maximum performance limits vary by machine series and machine type. If you're using Persistent Disk volumes, you must also configure your volumes to reach the target performance level.

This document covers the performance limits for each machine series that supports Persistent Disk.

To learn how to optimize your Persistent Disk performance, see Optimizing Persistent Disk performance.

For a discussion of Google Cloud Hyperdisk performance, see About performance for Hyperdisk. For Google Cloud Hyperdisk performance limits, see Hyperdisk performance limits.

Choose a Persistent Disk type

When you create a Persistent Disk volume, you can select one of the following disk types:

  • Balanced Persistent Disk (pd-balanced)
    • An alternative to SSD (Performance) Persistent Disk.
    • Balance of performance and cost. For most Compute Engine machine types, these disks have the same maximum IOPS as SSD Persistent Disk and lower IOPS per GiB. This disk type offers performance levels suitable for most general-purpose applications at a price point between that of standard and SSD Persistent Disk.
    • Uses solid-state drives (SSD).
  • SSD (Performance) Persistent Disk (pd-ssd)
    • Suitable for enterprise applications and high-performance databases that require lower latency and more IOPS than standard Persistent Disk provides.
    • Uses solid-state drives (SSD).
  • Standard Persistent Disk (pd-standard)
    • Suitable for large data processing workloads that primarily use sequential I/Os.
    • Uses standard hard disk drives (HDD).
  • Extreme Persistent Disk (pd-extreme)
    • Offers consistently high performance for both random access workloads and bulk throughput.
    • Designed for high-end database workloads.
    • Lets you provision the target IOPS.
    • Uses solid-state drives (SSD).
    • Available with a limited number of machine types.

If you create a disk in the Google Cloud console, the default disk type is pd-balanced. If you create a disk using the gcloud CLI or the Compute Engine API, the default disk type is pd-standard.

Each Persistent Disk type has unique performance limits that depend on the machine type and number of vCPUs in use.

Terminology and units

Persistent Disk performance, as discussed in this document, refers to IOPS and throughput.

  • IOPS stands for input/output operations per second. This is the number of individual reads and writes the volume performs or can perform within a second.
  • Throughput refers to how many bytes can be read from or written to a volume in a second. Throughput is measured in MiB/s.

How Persistent Disk performance limits work

The following summarizes Persistent Disk performance:

  • Performance depends on the machine type of the instance that you attach a Persistent Disk volume to, and increases with the instance's number of vCPUs.

  • A Persistent Disk volume's performance depends on its size. Each provisioned GiB of size includes a fixed amount of throughput and IOPS. For example, Standard Persistent Disk includes 0.12 MiB/s of throughput per GiB, so a 900 GiB volume has a maximum throughput of 108 MiB/s (900 GiB * 0.12 MiB/s).

  • Each Persistent Disk volume has a maximum limit that can be reached for its type, regardless of its size. For example, a zonal SSD Persistent Disk can reach at most 100,000 IOPS while Balanced Persistent Disk has a maximum of 80,000 IOPS.

  • A Persistent Disk volume's performance when attached to an instance might be higher if other Persistent Disk volumes of the same type are also attached to the instance and are idle. This is because performance is determined by the total size of all volumes of the same type that are attached to an instance.

    For example, suppose you have two 250 GiB SSD Persistent Disk volumes. If you attach both volumes to the same instance and one is idle, then the other volume might be able to reach the performance limits of a 500 GiB volume.

  • Balanced Persistent Disk and SSD Persistent Disk also offer a minimum performance level regardless of size called baseline performance.

For the per-GiB performance limits, see Zonal Persistent Disk performance limits by type and Regional Persistent Disk performance by type.

For the performance limits by machine type, see Persistent Disk performance limits by machine series.

Baseline performance for SSD and Balanced Persistent Disk

The following Persistent Disk types offer baseline IOPS and throughput performance in addition to the per GiB performance limits:

  • Balanced Persistent Disk
  • SSD Persistent Disk

Baseline performance is the same for all disk sizes and doesn't scale based on the number of disks of the same type that are attached to an instance. For example, if you have two zonal Balanced Persistent Disk attached to an instance, then they share a baseline performance of 3,000 IOPS.

To calculate the maximum expected performance of a Persistent Disk type, use the following formula. The combined disk size is the total size (in GiB) of all disks of the same type that are attached to the instance:

Maximum performance = B + (G * X)

Where:

  • B is the baseline performance for the Persistent Disk type.
  • G is the per GiB performance limit.
  • X is the combined disk size in GiB.

For example, the maximum IOPS of two 1,000 GiB zonal Balanced Persistent Disk attached to the same instance is 15,000. Baseline IOPS for Balanced Persistent Disk is 3,000; the per-GiB IOPS rate is 6; so the maximum total performance for the two volumes is calculated as follows:

3,000 + (6 * 2,000 GiB combined disk size) = 15,000 IOPS

The following table shows the baseline performance for Balanced and SSD Persistent Disk.

Zonal Persistent Disk

The following table shows the baseline sustained IOPS and throughput for zonal Persistent Disk:

Zonal
Balanced
PD
Zonal
SSD PD
Baseline IOPS per instance 3,000 6,000
Baseline Throughput (MiB/s) per instance 140 240

Regional Persistent Disk

Regional Persistent Disk are supported on only E2, N1, N2, and N2D instances. The following table shows the baseline sustained IOPS and throughput for regional Persistent Disk:

Regional
Balanced
PD
Regional
SSD PD
Baseline IOPS per instance 3,000 6,000
Baseline throughput (MiB/s) per instance 140 240

Configure your Persistent Disk to meet performance requirements

To achieve a target performance level (IOPS or throughput) for your workload, you must choose a size for your Persistent Disk volume and a VM with a machine type that can reach that performance level.

The actual performance achieved by your volume is the lesser of the disk's performance limit and the VM's performance limit:

Actual Performance = MIN (disk performance limit, VM machine type limit)

The disk performance limit is the maximum performance for the Persistent Disk volume based on its size. The VM machine type limit is the VM's machine type's maximum performance limit, which also varies by Persistent Disk type.

To determine the minimum Persistent Disk size and machine type for your workload's requirements, follow these steps:

  1. Determine the required disk size: To find the minimum total disk size (in GiB) needed to meet your target IOPS and throughput, see Performance limits by size.
  2. Determine the required VM machine type: To select a machine type and vCPU count that supports your target IOPS and throughput, review the limits in Performance limits by machine series.

Zonal Persistent Disk performance limits by type

This section lists the maximum performance limits for each zonal Persistent Disk type and the per-GiB performance rates.

Performance also depends on the disk size, machine type, and vCPU count.

For performance limits for common disk sizes, see Performance limits by size for zonal and regional Persistent Disk.

For performance limits by machine type, see Performance by machine type and vCPU count for zonal Persistent Disk.

IOPS limits by type for zonal Persistent Disk

The following table shows IOPS limits for zonal Persistent Disk.

Zonal
Standard
PD
Zonal
Balanced
PD
Zonal
SSD PD
Zonal
Extreme PD
Zonal
SSD PD in
multi-writer mode
Read IOPS per GiB 0.75 6 30 30
Write IOPS per GiB 1.5 6 30 30
Read IOPS per instance 7,500 80,000 100,000 120,000 100,000
Write IOPS per instance 15,000 80,000 100,000 120,000 100,000

Throughput limits by type for zonal Persistent Disk

The following table shows the throughput limits for zonal Persistent Disk. Persistent Disk can achieve greater performance on instances with more vCPUs. For more information, read Network egress caps on write throughput.

Zonal
Standard
PD
Zonal
Balanced
PD
Zonal
SSD PD
Zonal
Extreme PD
Zonal
SSD PD in
multi-writer mode
Throughput per GiB (MiB/s) 0.12 0.28 0.48 0.48
Read throughput per instance (MiB/s) 1,200 1,2001 1,2001 4,0002 1,200
Write throughput per instance (MiB/s) 400 1,2001 1,2001 3,0002 1,200

1T2A instances with 48 vCPUs can reach 1,800 MiB/s.
2Requires an N2 instance with at least 64 vCPUs to achieve the stated performance limit. For maximum limits for all other machine types, see Performance by machine type and vCPU count.

Regional Persistent Disk performance by type

This section shows the maximum and per-GiB IOPS and throughput limits for regional Persistent Disk.

For performance limits for common disk sizes, see Performance limits by size for zonal and regional Persistent Disk.

These conditions apply to the stated limits:

  • Performance depends on the machine type and vCPU count of the instance using the Persistent Disk volume.
  • Achieving the stated limits requires a compute instance with at least 64 vCPUs and an N2 machine type or an N1 machine type running on the Intel Skylake or newer CPU. Instances using other machine types, such as N2D, have lower performance limits.
  • Instances using E2 machine types have lower performance limits because E2 machine types support a maximum of 32 vCPUs.
  • Read IOPS per instance and read throughput per instance might be lower when the disk is in unreplicated mode.

Regional Persistent Disk can achieve greater performance when you modify factors that can affect performance, like disk size and number of vCPUs.

IOPS limits by type for regional Persistent Disk

The following table shows IOPS rates and maximums for regional Persistent Disk.

Regional
Standard
PD
Regional
Balanced
PD
Regional
SSD PD
Read IOPS per GiB 0.75 6 30
Write IOPS per GiB 1.5 6 30
Read IOPS per instance 7,500 80,000* 100,000#
Write IOPS per instance 15,000 60,000 80,000

* For N2D, the maximum read IOPS per instance for Balanced Persistent Disk is 60,000.
# For N2D, the maximum read IOPS per instance for SSD Persistent Disk is 70,000.
For N2D, the maximum write IOPS per instance for Balanced Persistent Disk is 50,000.
For N2D, the maximum write IOPS per instance for SSD Persistent Disk is 60,000.

Throughput limits by type for regional Persistent Disk

The following table shows the throughput limits for regional Persistent Disk.

Regional
Standard
PD
Regional
Balanced
PD
Regional
SSD PD
Throughput per GiB (MiB/s) 0.12 0.28 0.48
Read throughput per instance (MiB/s) 1,200 1,200 1,200
Write throughput per instance (MiB/s) 200 600 1,000

For N2D, the maximum write throughput per instance for SSD Persistent Disk is 600 MiB/s.

Performance limits by size for zonal and regional Persistent Disk

To estimate the maximum performance you can expect from a Persistent Disk volume of a given size, review the following sections for each Persistent Disk type.

SSD Persistent Disk performance limits by size

To determine the minimum size required for your SSD Persistent Disk volumes to reach a specific performance limit, review the information in this section.

The listed limits aren't guaranteed performance levels, but represent the maximum possible performance. To reach a particular limit, you must attach the volume to an instance that supports that level of performance.

If a specific size isn't listed, calculate performance using the following formulas, where x is the combined total size (in GiB) of all SSD Persistent Disk volumes that are attached to the instance, and instance_limit is the performance limit for your VM's machine type and vCPU count.

  • IOPS: MIN (instance_limit, (30x + 6,000))
  • Throughput: MIN (instance_limit, (0.48x + 240))

Suppose you want to attach a 500 GiB zonal SSD Persistent Disk volume to an N2 instance that has 4 vCPUs. The instance_limit—the SSD Persistent Disk throughput limit for a 4-vCPU N2 instance is 240 MiB/s. Using the formula, the maximum throughput the disk can reach with the instance is: MIN (240 MiB/s, 480 MiB/s (240 + (0.48 * 500))) .

To reach the maximum performance limit of 480 MiB/s, you must attach the disk to an N2 instance that has a SSD Persistent Disk throughput limit of at least 480 MiB/s.

The following table lists SSD Persistent Disk performance limits for common disk sizes.

Zonal SSD Persistent Disk

Performance limits by size for zonal SSD Persistent Disk
Size (GiB) Maximum (read/write) IOPS Maximum (read/write) throughput (MiB/s)
10 6,300 244.8
30 6,900 254.4
50 7,500 264
100 9,000 288
150 10,500 312
200 12,000 336
300 15,000 384
500 21,000 480
750 28,500 600
1,000 36,000 720
2,000 66,000 1,200
2,500 81,000 1,200
3,334 100,000 1,200
4,000 to 64,000 100,000 1,200

Regional SSD Persistent Disk

Performance limits by size for regional SSD Persistent Disk
Size (GiB) Maximum read IOPS Maximum write IOPS Maximum read throughput (MiB/s) Maximum write throughput (MiB/s)
10 6,300 6,300 244.8 244.8
30 6,900 6,900 254.4 254.4
50 7,500 7,500 264 264
100 9,000 9,000 288 288
150 10,500 10,500 312 312
200 12,000 12,000 336 336
300 15,000 15,000 384 384
500 21,000 21,000 480 480
750 28,500 28,500 600 600
1,000 36,000 36,000 720 720
2,000 66,000 66,000 1,200 1,000
2,500 81,000 80,000 1,200 1,000
3,334 100,000 80,000 1,200 1,000
4,000 to 64,000 100,000 80,000 1,200 1,000

The Size column in the preceding table refers to the combined size of all SSD Persistent Disk volumes attached to the same instance. For example, the performance limit is the same whether you attach one 500 GiB SSD Persistent Disk volume to the instance, or five 100 GiB volumes. For more information, see Multiple disks attached to a single compute instance.

IOPS for SSD Persistent Disk are half-duplex, but throughput is full-duplex. This means that the combined total read and write IOPS can't exceed the stated limit, but a disk can reach both the stated read and write limits simultaneously.

Balanced Persistent Disk performance limits by size

To determine the minimum size required for your Balanced Persistent Disk volumes to reach a specific performance limit, review the information in this section.

The listed limits aren't guaranteed performance levels, but represent the maximum possible performance. To reach a particular limit, you must attach the volume to an instance that supports that level of performance.

If a specific size isn't listed, calculate performance using the following formulas, where x is the combined total size (in GiB) of all Balanced Persistent Disk volumes that are attached to the instance, and instance_limit is the performance limit for your instance's machine type and vCPU count.

  • IOPS: MIN (instance_limit, (6x + 3,000), 80,000)
  • Throughput: MIN (instance_limit, (0.28x + 140), 1,200)

Suppose you want to attach a 500 GiB zonal Balanced Persistent Disk volume to an N2 instance that has 4 vCPUs. The instance_limit—the Balanced Persistent Disk throughput limit for a 4-vCPU N2 instance is 240 MiB/s. Using the formula, the maximum throughput the disk can reach with the instance is: MIN (240 MiB/s, 280 MiB/s (140 + (0.28 * 500))) .

To reach the maximum performance limit of 280 MiB/s, you must attach the disk to an N2 instance that has a Balanced Persistent Disk throughput limit of at least 280 MiB/s.

The following table lists Balanced Persistent Disk performance limits for common disk sizes.

Zonal Balanced Persistent Disk

Performance limits by size for zonal Balanced Persistent Disk
Size (GiB) Maximum IOPS Maximum read throughput (MiB/s) Maximum write throughput (MiB/s)
10 3,060 142.8 142.8
30 3,180 148.4 148.4
50 3,300 154 154
100 3,600 168 168
150 3,900 182 182
300 4,800 224 224
500 6,000 280 280
1,000 9,000 420 420
2,000 15,000 700 700
2,500 18,000 840 840
4,000 27,000 1,200 1,200
5,000 33,000 1,200 1,200
8,000 51,000 1,200 1,200
10,000 63,000 1,200 1,200
12,834 to 64,000 80,000 1,200 1,200

Regional Balanced Persistent Disk

Performance limits by size for regional Balanced Persistent Disk
Size (GiB) Maximum read IOPS Maximum write IOPS Maximum read throughput (MiB/s) Maximum write throughput (MiB/s)
10 3,060 3,060 142.8 142.8
30 3,180 3,180 148.4 148.4
50 3,300 3,300 154 154
100 3,600 3,600 168 168
150 3,900 3,900 182 182
300 4,800 4,800 224 224
500 6,000 6,000 280 280
1,000 9,000 9,000 420 420
2,000 15,000 15,000 700 600
2,500 18,000 18,000 840 600
3,334 23,004 23,004 1,074 600
4,000 27,000 27,000 1,200 600
5,000 33,000 33,000 1,200 600
8,000 51,000 51,000 1,200 600
10,000 63,000 60,000 1,200 600
12,834 to 64,000 80,000 60,000 1,200 600

The Size column in the preceding table refers to the combined size of all Balanced Persistent Disk volumes attached to the same instance. For example, the performance limit is the same whether you attach one 500 GiB Balanced Persistent Disk volume to the instance, or five 100 GiB volumes. For more information, see Multiple disks attached to a single compute instance.

IOPS for Balanced Persistent Disk are half-duplex, but throughput is full duplex. This means that the total read and write IOPS can't exceed the stated limit, but a disk can reach both the stated read and write limits simultaneously.

Standard Persistent Disk performance limits by size

To determine the minimum size required for your Standard Persistent Disk volumes to reach a specific performance limit, review the information in this section.

The listed limits aren't guaranteed performance levels, but represent the maximum possible performance. To reach a particular limit, you must attach the volume to an instance that supports that level of performance.

If a specific size isn't listed, calculate performance using the following formulas, where x is the combined total size (in GiB) of all Standard Persistent Disk volumes attached to the instance, and instance_limit is the performance limit for your instance's machine type and vCPU count.

  • Read IOPS: MIN (instance_limit, 0.75x)
  • Write IOPS: MIN (instance_limit, 1.5x)
  • Throughput: MIN (instance_limit, 0.12x)

For example, a 500 GiB Standard Persistent Disk volume can reach up to 60 MiB/s of throughput (0.12 * 500). If you attach it to a 4-vCPU N2 instance, which has a Standard Persistent Disk throughput limit, of 240 MiB/s, the throughput limit for the volume still won't exceed 60 MiB/s.

The following table lists Standard Persistent Disk performance limits for common disk sizes.

Zonal Standard Persistent Disk

Performance limits by size for zonal Standard Persistent Disk
Size (GiB) Maximum read IOPS Maximum write IOPS Maximum read throughput (MiB/s) Maximum write throughput (MiB/s)
150 112.5 225 18 18
200 150 300 24 24
300 225 450 36 36
500 375 750 60 60
750 562.5 1,125 90 90
1,000 750 1,500 120 120
2,000 1,500 3,000 240 240
2,500 1,875 3,750 300 300
3,334 2,500 5,001 400 400
4,000 3,000 6,000 480 400
5,000 3,750 7,500 600 400
8,000 6,000 12,000 960 400
10,000 7,500 15,000 1,200 400
12,834 7,500 15,000 1,200 400
15,000 7,500 15,000 1,200 400

Regional Standard Persistent Disk

Performance limits by size for regional Standard Persistent Disk
Size (GiB) Maximum read IOPS Maximum write IOPS Maximum read throughput (MiB/s) Maximum write throughput (MiB/s)
150 112.5 225 18 18
200 150 300 24 24
300 225 450 36 36
500 375 750 60 60
750 562.5 1,125 90 90
1,000 750 1,500 120 120
2,000 1,500 3,000 240 200
2,500 1,875 3,750 300 200
3,334 2,500 5,001 400.08 200
4,000 3,000 6,000 480 200
5,000 3,750 7,500 600 200
8,000 6,000 12,000 960 200
10,000 7,500 15,000 1,200 200
12,834 7,500 15,000 1,200 200
15,000 7,500 15,000 1,200 200

The Size column in the preceding table refers to the combined size of all Standard Persistent Disk volumes attached to the same instance. For example, the performance limit is the same whether you attach one 500 GiB Standard Persistent Disk volume to the instance, or five 100 GiB volumes. For more information, see Multiple disks attached to a single compute instance.

IOPS and throughput for Standard Persistent Disk are half-duplex. This means the combined total read and write IOPS or throughput at any time can't exceed the stated limit.

Extreme Persistent Disk performance limits

Performance for Extreme Persistent Disk volumes is independent of the volume's size. You can specify a target IOPS level for a volume, from 2,500 to 120,000 IOPS.

You can't specify a throughput level for Extreme Persistent Disk volumes. Instead, throughput scales with the number of IOPS you provision at a rate of 256 KiB/s of throughput per I/O. For more information, see Performance limits for Extreme Persistent Disk.

Latency and data transmission for Persistent Disk

For Balanced and SSD (performance) Persistent Disk volumes, the read and write throughput limits are independent of each other. This means that a disk can reach both the stated read and write limits simultaneously.

Balanced Persistent Disk, SSD Persistent Disk, and Extreme Persistent Disk are designed for sub-millisecond latencies.

Sharing disks between instances

Attaching a disk to multiple instances in read-only mode or in multi-writer mode does not affect aggregate performance or cost. Each machine gets a share of the per-disk performance limit. Persistent Disk created in multi-writer mode have specific IOPS and throughput limits. To learn how to share Persistent Disk between multiple instances, see Sharing Persistent Disk between instances.

Persistent Disk I/O operations share a common path with network traffic within an instance's hypervisor. Therefore, if the instance has significant network traffic, the actual read bandwidth and IOPS consistency might be less than the listed maximum limits. Some variability in the performance limits is to be expected, especially when operating near the maximum IOPS limits with an I/O size of 16 KB. For a summary of bandwidth expectations, see Bandwidth summary table.

Persistent Disk performance limits by machine series

Persistent Disk performance scales with the size of the disk and with the number of vCPUs on your instance.

Performance scales until it reaches either the limits of the disk or the limits of the instance to which the disk is attached. The machine type and the number of vCPUs on the instance determine the per-instance limits.

The following tables show performance limits for zonal Persistent Disk according to the machine type and number of vCPUs on the instance to which the disk is attached. For a given Persistent Disk type, the limits are the maximum across all volumes of that type that are attached to the same instance.

For Balanced and SSD Persistent Disk volumes, the read and write throughput limits are independent of each other.

A2 Ultra instances

pd-balanced

Machine type Maximum write IOPS Maximum read IOPS Maximum write throughput (MiB/s) Maximum read throughput (MiB/s)
a2-ultragpu-1g 15,000 15,000 800 800
a2-ultragpu-2g 20,000 20,000 1,200 1,200
a2-ultragpu-4g 50,000 50,000 1,200 1,200
a2-ultragpu-8g 80,000 80,000 1,200 1,200

pd-ssd

Machine type Maximum write IOPS Maximum read IOPS Maximum write throughput (MiB/s) Maximum read throughput (MiB/s)
a2-ultragpu-1g 15,000 15,000 800 800
a2-ultragpu-2g 25,000 25,000 1,200 1,200
a2-ultragpu-4g 60,000 60,000 1,200 1,200
a2-ultragpu-8g 100,000 100,000 1,200 1,200

pd-standard

Machine type Maximum write IOPS Maximum read IOPS Maximum write throughput (MiB/s) Maximum read throughput (MiB/s)
a2-ultragpu-1g 15,000 5,000 400 800
a2-ultragpu-2g 15,000 7,500 400 1,200
a2-ultragpu-4g 15,000 7,500 400 1,200
a2-ultragpu-8g 15,000 7,500 400 1,200

A2 Standard instances

pd-balanced

Machine type Maximum write IOPS Maximum read IOPS Maximum write throughput (MiB/s) Maximum read throughput (MiB/s)
a2-highgpu-1g 15,000 15,000 800 800
a2-highgpu-2g 20,000 20,000 1,200 1,200
a2-highgpu-4g 50,000 50,000 1,200 1,200
a2-highgpu-8g 80,000 80,000 1,200 1,200
a2-megagpu-16g 80,000 80,000 1,200 1,200

pd-ssd

Machine type Maximum write IOPS Maximum read IOPS Maximum write throughput (MiB/s) Maximum read throughput (MiB/s)
a2-highgpu-1g 15,000 15,000 800 800
a2-highgpu-2g 25,000 25,000 1,200 1,200
a2-highgpu-4g 60,000 60,000 1,200 1,200
a2-highgpu-8g 100,000 100,000 1,200 1,200
a2-megagpu-16g 100,000 100,000 1,200 1,200

pd-standard

Machine type Maximum write IOPS Maximum read IOPS Maximum write throughput (MiB/s) Maximum read throughput (MiB/s)
a2-highgpu-1g 15,000 5,000 400 800
a2-highgpu-2g 15,000 7,500 400 1,200
a2-highgpu-4g 15,000 7,500 400 1,200
a2-highgpu-8g 15,000 7,500 400 1,200
a2-megagpu-16g 15,000 7,500 400 1,200

A3 Mega instances

pd-balanced

Machine type Maximum write IOPS Maximum read IOPS Maximum write throughput (MB/s) Maximum read throughput (MB/s)
a3-megagpu-8g 80,000 80,000 1,200 1,200

pd-ssd

Machine type Maximum write IOPS Maximum read IOPS Maximum write throughput (MB/s) Maximum read throughput (MB/s)
a3-megagpu-8g 80,000 80,000 1,200 1,200

A3 High instances

pd-balanced

Machine type Maximum write IOPS Maximum read IOPS Maximum write throughput (MB/s) Maximum read throughput (MB/s)
a3-highgpu-1g 15,000 15,000 1,200 1,200
a3-highgpu-2g 30,000 30,000 1,200 1,200
a3-highgpu-4g 60,000 60,000 1,200 1,200
a3-highgpu-8g 80,000 80,000 1,200 1,200

pd-ssd

Machine type Maximum write IOPS Maximum read IOPS Maximum write throughput (MB/s) Maximum read throughput (MB/s)
a3-highgpu-1g 15,000 15,000 1,200 1,200
a3-highgpu-2g 30,000 30,000 1,200 1,200
a3-highgpu-4g 60,000 60,000 1,200 1,200
a3-highgpu-8g 80,000 80,000 1,200 1,200

A3 Edge instances

pd-balanced

Machine type Maximum write IOPS Maximum read IOPS Maximum write throughput (MB/s) Maximum read throughput (MB/s)
a3-edgegpu-8g 80,000 80,000 1,200 1,200

pd-ssd

Machine type Maximum write IOPS Maximum read IOPS Maximum write throughput (MB/s) Maximum read throughput (MB/s)
a3-edgegpu-8g 80,000 80,000 1,200 1,200

C2 instances

pd-balanced

Number of vCPUs Maximum write IOPS Maximum read IOPS Maximum write throughput (MiB/s) Maximum read throughput (MiB/s)
4 4,000 4,000 240 240
8 4,000 4,000 240 240
16 4,000 8,000 480 600
30 8,000 15,000 480 600
60 15,000 15,000 800 1,200

pd-ssd

Number of vCPUs Maximum write IOPS Maximum read IOPS Maximum write throughput (MiB/s) Maximum read throughput (MiB/s)
4 4,000 4,000 240 240
8 4,000 4,000 240 240
16 4,000 8,000 480 600
30 8,000 15,000 480 600
60 15,000 30,000 800 1,200

pd-standard

Number of vCPUs Maximum write IOPS Maximum read IOPS Maximum write throughput (MiB/s) Maximum read throughput (MiB/s)
4 4,000 3,000 240 240
8 4,000 3,000 240 240
16 4,000 3,000 240 240
30 8,000 3,000 240 240
60 15,000 3,000 240 240

C2D Instances

pd-balanced

Number of vCPUs Maximum write IOPS Maximum read IOPS Maximum write throughput (MiB/s) Maximum read throughput (MiB/s)
2 4,590 4,080 245 245
4 4,590 4,080 245 245
8 4,590 4,080 245 245
16 4,590 8,160 245 326
32 8,160 15,300 245 612
56 8,160 15,300 245 612
112 15,300 30,600 408 1,224

pd-ssd

Number of vCPUs Maximum write IOPS Maximum read IOPS Maximum write throughput (MiB/s) Maximum read throughput (MiB/s)
2 4,590 4,080 245 245
4 4,590 4,080 245 245
8 4,590 4,080 245 245
16 4,590 8,160 245 326
32 8,160 15,300 245 612
56 8,160 15,300 245 612
112 15,300 30,600 408 1,224

pd-standard

Number of vCPUs Maximum write IOPS Maximum read IOPS Maximum write throughput (MiB/s) Maximum read throughput (MiB/s)
2 4,590 3,060 245 245
4 4,590 3,060 245 245
8 4,590 3,060 245 245
16 4,590 3,060 245 245
32 8,160 3,060 245 245
56 8,160 3,060 245 245
112 15,300 3,060 245 245

C3D Instances

pd-balanced

Number of vCPUs Maximum write IOPS Maximum read IOPS Maximum write throughput (MiB/s) Maximum read throughput (MiB/s)
4 15,000 15,000 240 240
8 25,000 25,000 800 800
16 25,000 25,000 1,200 1,200
30 50,000 50,000 1,200 1,200
60 80,000 80,000 1,200 1,200
90 80,000 80,000 1,200 1,200
180 80,000 80,000 1,200 1,200
360 80,000 80,000 1,200 1,200

pd-ssd

Number of vCPUs Maximum write IOPS Maximum read IOPS Maximum write throughput (MiB/s) Maximum read throughput (MiB/s)
4 15,000 15,000 240 240
8 15,000 15,000 800 800
16 25,000 25,000 1,200 1,200
30 60,000 60,000 1,200 1,200
60 80,000 80,000 1,200 1,200
90 80,000 80,000 1,200 1,200
180 80,000 80,000 1,200 1,200
360 80,000 80,000 1,200 1,200

C3 Instances

pd-balanced

Number of vCPUs Maximum write IOPS Maximum read IOPS Maximum write throughput (MiB/s) Maximum read throughput (MiB/s)
4 15,000 15,000 240 240
8 15,000 15,000 240 240
22 20,000 20,000 800 800
44 50,000 50,000 1,200 1,200
88 80,000 80,000 1,200 1,200
176 80,000 80,000 1,200 1,200

pd-ssd

Number of vCPUs Maximum write IOPS Maximum read IOPS Maximum write throughput (MiB/s) Maximum read throughput (MiB/s)
4 15,000 15,000 240 240
8 15,000 15,000 240 240
22 25,000 25,000 800 800
44 60,000 60,000 1,200 1,200
88 80,000 80,000 1,200 1,200
176 80,000 80,000 1,200 1,200

E2 Instances

pd-balanced

Number of vCPUs Maximum write IOPS Maximum read IOPS Maximum write throughput (MiB/s) Maximum read throughput (MiB/s)
e2-medium1 10,000 12,000 200 200
2-7 15,000 15,000 240 240
8-15 15,000 15,000 8002 800
16-31 20,000 20,000 1,0002 1,200
32 or more 50,000 50,000 1,0002 1,200

1 E2 shared-core machine types run two vCPUs simultaneously shared on one physical core for a specific fraction of time.
2 For regional Balanced Persistent Disk, the maximum write throughput is 600 MiB/s.

pd-ssd

Number of vCPUs Maximum write IOPS Maximum read IOPS Maximum write throughput (MiB/s) Maximum read throughput (MiB/s)
e2-medium1 10,000 12,000 200 200
2-7 15,000 15,000 240 240
8-15 15,000 15,000 800 800
16-31 25,000 25,000 1,000 1,200
32 or more 60,000 60,000 1,000 1,200

1 E2 shared-core machine types run two vCPUs simultaneously shared on one physical core for a specific fraction of time.
2 For regional SSD Persistent Disk, the maximum write IOPS is 80,000 and the maximum write throughput is 1,000 MiB/s.

pd-standard

Number of vCPUs Maximum write IOPS Maximum read IOPS Maximum write throughput (MiB/s) Maximum read throughput (MiB/s)
e2-medium1 10,000 1,000 200 200
2-7 15,000 3,000 2402 240
8-15 15,000 5,000 4002 800
16 or more 15,000 7,500 4002 1,200

1 E2 shared-core machine types run two vCPUs simultaneously shared on one physical core for a specific fraction of time.
2 For regional Standard Persistent Disk, the maximum write throughput is 200 MiB/s.

G2 Instances

pd-balanced

Machine type Maximum write IOPS Maximum read IOPS Maximum write throughput (MiB/s) Maximum read throughput (MiB/s)
g2-standard-4 15,000 15,000 240 240
g2-standard-8 15,000 15,000 800 800
g2-standard-12 15,000 15,000 800 800
g2-standard-16 20,000 20,000 1,200 1,200
g2-standard-24 20,000 20,000 1,200 1,200
g2-standard-32 50,000 50,000 1,200 1,200
g2-standard-48 50,000 50,000 1,200 1,200
g2-standard-96 80,000 80,000 1,200 1,200

pd-ssd

Machine type Maximum write IOPS Maximum read IOPS Maximum write throughput (MiB/s) Maximum read throughput (MiB/s)
g2-standard-4 15,000 15,000 240 240
g2-standard-8 15,000 15,000 800 800
g2-standard-12 15,000 15,000 800 800
g2-standard-16 25,000 25,000 1,200 1,200
g2-standard-24 25,000 25,000 1,200 1,200
g2-standard-32 60,000 60,000 1,200 1,200
g2-standard-48 60,000 60,000 1,200 1,200
g2-standard-96 100,000 100,000 1,200 1,200

H3 Instances

pd-balanced

Number of vCPUs Maximum write IOPS Maximum read IOPS Maximum write throughput (MiB/s) Maximum read throughput (MiB/s)
88 15,000 15,000 240 240

N1 Instances

pd-balanced

Number of vCPUs Maximum write IOPS Maximum read IOPS Maximum write throughput (MiB/s) Maximum read throughput (MiB/s)
1 15,000 15,000 204 240
2-7 15,000 15,000 240 240
8-15 15,000 15,000 8001 800
16-31 20,000 20,000 1,2001 1,200
32-63 50,000 50,000 1,2001 1,200
64 or more 80,0001 80,000 1,2001 1,200

1 For regional Balanced Persistent Disk, the maximum write IOPS is 60,000 and the maximum write throughput is 600 MiB/s.

pd-ssd

Number of vCPUs Maximum write IOPS Maximum read IOPS Maximum write throughput (MiB/s) Maximum read throughput (MiB/s)
1 15,000 15,000 204 240
2-7 15,000 15,000 240 240
8-15 15,000 15,000 800 800
16-31 25,000 25,000 1,2001 1,200
32-63 60,000 60,000 1,2001 1,200
64 or more 100,0001 100,000 1,2001 1,200

1 For regional SSD Persistent Disk, the maximum write IOPS is 80,000 and the maximum write throughput is 1,000 MiB/s.

pd-standard

Number of vCPUs Maximum write IOPS Maximum read IOPS Maximum write throughput (MiB/s) Maximum read throughput (MiB/s)
1 15,000 Up to 3,000 2041 240
2-7 15,000 3,000 2401 240
8-15 15,000 5,000 4001 800
16 or more 15,000 7,500 4001 1,200

1 For regional Standard Persistent Disk, the maximum write throughput is 200 MiB/s.

N2 Instances

pd-balanced

Number of vCPUs Maximum write IOPS Maximum read IOPS Maximum write throughput (MiB/s) Maximum read throughput (MiB/s)
2-7 15,000 15,000 240 240
8-15 15,000 15,000 8001 800
16-31 20,000 20,000 1,2001 1,200
32-63 50,000 50,000 1,2001 1,200
64 or more 80,0001 80,000 1,2001 1,200

1 For regional Balanced Persistent Disk, the maximum write IOPS is 60,000 and the maximum write throughput is 600 MiB/s.

pd-ssd

Number of vCPUs Maximum write IOPS Maximum read IOPS Maximum write throughput (MiB/s) Maximum read throughput (MiB/s)
2-7 15,000 15,000 240 240
8-15 15,000 15,000 800 800
16-31 25,000 25,000 1,2001 1,200
32-63 60,000 60,000 1,2001 1,200
64 or more 100,0001 100,000 1,2001 1,200

1 For regional SSD Persistent Disk, the maximum write IOPS is 80,000 and the maximum write throughput is 1,000 MiB/s.

pd-standard

Number of vCPUs Maximum write IOPS Maximum read IOPS Maximum write throughput (MiB/s) Maximum read throughput (MiB/s)
2-7 15,000 3,000 2401 240
8-15 15,000 5,000 4001 800
16 or more 15,000 7,500 4001 1,200

1 For regional Standard Persistent Disk, the maximum write throughput is 200 MiB/s.

pd-extreme

Machine type Maximum write IOPS Maximum read IOPS Maximum write throughput (MiB/s) Maximum read throughput (MiB/s)
n2-standard-64 120,000 120,000 3,000 4,000
n2-standard-80 120,000 120,000 3,000 4,000
n2-standard-96 120,000 120,000 3,000 4,000
n2-standard-128 120,000 120,000 3,000 4,000
n2-highmem-64 120,000 120,000 3,000 4,000
n2-highmem-80 120,000 120,000 3,000 4,000
n2-highmem-96 120,000 120,000 3,000 4,000
n2-highmem-128 120,000 120,000 3,000 4,000
n2-highcpu-64 120,000 120,000 3,000 4,000
n2-highcpu-80 120,000 120,000 3,000 4,000
n2-highcpu-96 120,000 120,000 3,000 4,000

N2 Instances with 96 or more vCPUs require the Intel Ice Lake CPU platform.

N2D Instances

pd-balanced

Number of vCPUs Maximum write IOPS Maximum read IOPS Maximum write throughput (MiB/s) Maximum read throughput (MiB/s)
2-7 15,000 15,000 240 240
8-15 15,000 15,000 8001 800
16-31 20,000 20,000 1,2001 1,200
32-63 50,000 50,000 1,2001 1,200
64 or more Up to 80,0001 Up to 80,000 1,2001 1,200

1 For regional Balanced Persistent Disk, the maximum write IOPS is 60,000 and the maximum write throughput is 600 MiB/s.

pd-ssd

Number of vCPUs Maximum write IOPS Maximum read IOPS Maximum write throughput (MiB/s) Maximum read throughput (MiB/s)
2-7 15,000 15,000 240 240
8-15 15,000 15,000 800 800
16-31 25,000 25,000 1,2001 1,200
32-63 60,000 60,000 1,2001 1,200
64 or more Up to 100,0001 Up to 100,000 1,200 1,200

1 For regional SSD Persistent Disk, the maximum write IOPS is 80,000 and the maximum write throughput is 1,000 MiB/s.

pd-standard

Number of vCPUs Maximum write IOPS Maximum read IOPS Maximum write throughput (MiB/s) Maximum read throughput (MiB/s)
2-7 15,000 3,000 2401 240
8-15 15,000 5,000 4001 800
16 or more 15,000 7,500 4001 1,200

1 For regional Standard Persistent Disk, the maximum write throughput is 200 MiB/s.

M1 Instances

pd-balanced

Machine type Maximum write IOPS Maximum read IOPS Maximum write throughput (MiB/s) Maximum read throughput (MiB/s)
m1-megamem-96 80,000 80,000 1,200 1,200
m1-ultramem-40 60,000 60,000 1,200 1,200
m1-ultramem-80 70,000 70,000 1,200 1,200
m1-ultramem-160 70,000 70,000 1,200 1,200

pd-ssd

Machine type Maximum write IOPS Maximum read IOPS Maximum write throughput (MiB/s) Maximum read throughput (MiB/s)
m1-megamem-96 100,000 100,000 1,200 1,200
m1-ultramem-40 60,000 60,000 1,200 1,200
m1-ultramem-80 70,000 70,000 1,200 1,200
m1-ultramem-160 70,000 70,000 1,200 1,200

pd-standard

Machine type Maximum write IOPS Maximum read IOPS Maximum write throughput (MiB/s) Maximum read throughput (MiB/s)
m1-megamem-96 15,000 7,500 400 1,200
m1-ultramem-40 15,000 7,500 400 1,200
m1-ultramem-80 15,000 7,500 400 1,200
m1-ultramem-160 15,000 7,500 400 1,200

pd-extreme

Machine type Maximum write IOPS Maximum read IOPS Maximum write throughput (MiB/s) Maximum read throughput (MiB/s)
m1-megamem-96 90,000 90,000 2,200 2,200

M2 Instances

pd-balanced

Machine type Maximum write IOPS Maximum read IOPS Maximum write throughput (MiB/s) Maximum read throughput (MiB/s)
m2-megamem-416 40,000 40,000 1,200 1,200
m2-ultramem-208 40,000 40,000 1,200 1,200
m2-ultramem-416 40,000 40,000 1,200 1,200
m2-hypermem-416 40,000 40,000 1,200 1,200

pd-ssd

Machine type Maximum write IOPS Maximum read IOPS Maximum write throughput (MiB/s) Maximum read throughput (MiB/s)
m2-megamem-416 40,000 40,000 1,200 1,200
m2-ultramem-208 40,000 40,000 1,200 1,200
m2-ultramem-416 40,000 40,000 1,200 1,200
m2-hypermem-416 40,000 40,000 1,200 1,200

pd-standard

Machine type Maximum write IOPS Maximum read IOPS Maximum write throughput (MiB/s) Maximum read throughput (MiB/s)
m2-megamem-416 15,000 7,500 400 1,200
m2-ultramem-208 15,000 7,500 400 1,200
m2-ultramem-416 15,000 7,500 400 1,200
m2-hypermem-416 15,000 7,500 400 1,200

pd-extreme

Machine type Maximum write IOPS Maximum read IOPS Maximum write throughput (MiB/s) Maximum read throughput (MiB/s)
m2-megamem-416 40,000 40,000 1,200 2,200
m2-ultramem-208 40,000 40,000 1,200 2,200
m2-ultramem-416 40,000 40,000 1,200 2,200
m2-hypermem-416 40,000 40,000 1,200 2,200

M3 Instances

pd-balanced

Machine type Maximum write IOPS Maximum read IOPS Maximum write throughput (MiB/s) Maximum read throughput (MiB/s)
m3-megamem-64 40,000 40,000 1,200 1,200
m3-megamem-128 80,000 80,000 1,200 1,200
m3-ultramem-32 40,000 40,000 1,200 1,200
m3-ultramem-64 40,000 40,000 1,200 1,200
m3-ultramem-128 80,000 80,000 1,200 1,200

pd-ssd

Machine type Maximum write IOPS Maximum read IOPS Maximum write throughput (MiB/s) Maximum read throughput (MiB/s)
m3-megamem-64 40,000 40,000 1,200 1,200
m3-megamem-128 80,000 80,000 1,200 1,200
m3-ultramem-32 40,000 40,000 1,200 1,200
m3-ultramem-64 40,000 40,000 1,200 1,200
m3-ultramem-128 80,000 80,000 1,200 1,200

pd-extreme

Machine type Maximum write IOPS Maximum read IOPS Maximum write throughput (MiB/s) Maximum read throughput (MiB/s)
m3-megamem-64 40,000 40,000 1,200 2,200
m3-megamem-128 80,000 80,000 1,700 2,200
m3-ultramem-32 40,000 40,000 1,200 2,200
m3-ultramem-64 40,000 40,000 1,200 2,200
m3-ultramem-128 80,000 80,000 1,700 2,200

T2D Instances

pd-balanced

Number of vCPUs Maximum write IOPS Maximum read IOPS Maximum write throughput (MiB/s) Maximum read throughput (MiB/s)
1 15,000 15,000 204 240
2-7 15,000 15,000 240 240
8-15 15,000 15,000 800 800
16-31 20,000 20,000 1,200 1,200
32-60 50,000 50,000 1,200 1,200

pd-ssd

Number of vCPUs Maximum write IOPS Maximum read IOPS Maximum write throughput (MiB/s) Maximum read throughput (MiB/s)
1 15,000 15,000 204 240
2-7 15,000 15,000 240 240
8-15 15,000 15,000 800 800
16-31 25,000 25,000 1,200 1,200
32-60 60,000 60,000 1,200 1,200

pd-standard

Number of vCPUs Maximum write IOPS Maximum read IOPS Maximum write throughput (MiB/s) Maximum read throughput (MiB/s)
1 15,000 3,000 204 240
2-7 15,000 3,000 240 240
8-15 15,000 5,000 400 800
16 or more 15,000 7,500 400 1,200

T2A Instances

pd-balanced

Number of vCPUs Maximum write IOPS Maximum read IOPS Maximum write throughput (MiB/s) Maximum read throughput (MiB/s)
1 20,000 20,000 204 240
2-7 20,000 20,000 240 240
8-15 25,000 25,000 800 800
16-31 25,000 25,000 1,200 1,200
32-47 60,000 60,000 1,200 1,200
48 80,000 80,000 1,800 1,800

pd-ssd

Number of vCPUs Maximum write IOPS Maximum read IOPS Maximum write throughput (MiB/s) Maximum read throughput (MiB/s)
1 20,000 20,000 204 240
2-7 20,000 20,000 240 240
8-15 25,000 25,000 800 800
16-31 25,000 25,000 1,200 1,200
32-47 60,000 60,000 1,200 1,200
48 80,000 80,000 1,800 1,800

pd-standard

Number of vCPUs Maximum write IOPS Maximum read IOPS Maximum write throughput (MiB/s) Maximum read throughput (MiB/s)
1 15,000 1,000 204 240
2-3 15,000 2,400 240 240
4-7 15,000 3,000 240 240
8-15 15,000 5,000 400 800
16 or more 15,000 7,500 400 1,200

TPU v5e instances

pd-balanced

Machine type Maximum IOPS
(read/write)
Maximum throughput (read/write)
(MiB/s)
ct5lp-hightpu-1t 20,000 1,200
ct5lp-hightpu-4t 80,000 1,200
ct5lp-hightpu-8t 80,000 1,200

TPU v5p instances

pd-balanced

Machine type Maximum IOPS
(read/write)
Maximum throughput (read/write)
(MiB/s)
ct5p-hightpu-4t 80,000 1,200

TPU v3 and TPU v4 instances

pd-balanced

Machine type Maximum IOPS
(read/write)
Maximum throughput (read/write)
(MiB/s)
ct3-hightpu-4t 80,000 1,200
ct3p-hightpu-4t 80,000 1,200
ct4p-hightpu-4t 80,000 1,200

Z3 Instances

pd-balanced

Number of vCPUs Maximum write IOPS Maximum read IOPS Maximum write throughput (MiB/s) Maximum read throughput (MiB/s)
8 to 14 15,000 15,000 240 240
22 to 32 20,000 20,000 800 800
44 50,000 50,000 1,200 1,200
88 80,000 80,000 1,200 1,200
176 80,000 80,000 1,200 1,200

pd-ssd

Number of vCPUs Maximum write IOPS Maximum read IOPS Maximum write throughput (MiB/s) Maximum read throughput (MiB/s)
8 to 14 15,000 15,000 240 240
22 to 32 25,000 25,000 800 800
44 60,000 60,000 1,200 1,200
88 80,000 80,000 1,200 1,200
176 80,000 80,000 1,200 1,200

Example

Consider a 1,000 GiB zonal SSD Persistent Disk attached to an N2 instance with 4 vCPUs. The read limit based solely on the size of the disk is 36,000 IOPS (6,000 baseline IOPS + (30 IOPS per GiB * 1,000 GiB)). However, the instance has only 4 vCPUs so the read limit is restricted to 15,000 IOPS.

Review performance

You can review Persistent Disk performance metrics in Cloud Monitoring, Google Cloud's integrated monitoring solution.

To learn more, see Reviewing Persistent Disk performance metrics.

Optimize disk performance

Keep the following factors in mind when reviewing the performance of your Persistent Disk volumes:

  • Persistent Disk are networked storage and generally have higher latency compared to physical disks or Local SSDs. To reach the maximum performance limits of the Persistent Disk, you must issue enough I/O requests in parallel. To check if you're using a high enough queue depth to reach your required performance levels, see I/O queue depth.

  • Make sure that your application is issuing enough I/O requests to saturate the disk. Disk saturation occurs when the CPU time during I/O requests issued to the device is very high.

  • For workloads that primarily involve small (from 4 KB to 16 KB) random I/O requests, the limiting performance factor is I/O requests per second (IOPS).

  • For workloads that primarily involve sequential or large (256 KB to 1 MB) random I/O requests, the limiting performance factor is throughput.

To increase disk performance, start with the following steps:

  • Resize your Persistent Disk to increase the per-disk IOPS and throughput limits. Persistent Disk don't have any reserved, unusable capacity, so you can use the full disk without performance degradation. However, certain file systems and applications might perform worse as the disk becomes full, so you might need to consider increasing the size of your disk to avoid such situations.

  • Change the machine type and number of vCPUs on the instance to increase the per-instance IOPS and throughput limits.

After choosing the right disk size and machine type for your instance to resolve any performance bottlenecks, your application and OS might need additional tuning. For more information, see Optimizing Persistent Disk performance and Optimizing Local SSD performance.

What's next