A cluster in Memorystore for Redis Cluster might experience the following conditions, which
prevent it from performing optimally:

- The cluster has a high CPU or memory usage.
- There are repeated cache flushes in the cluster because of memory exhaustion.
- You can't create backups for the cluster because of high memory utilization or high write traffic.
- Replicas can't synchronize data with the cluster because of a high level of write traffic.

To resolve these issues, use the **High resource utilization** health issue. To
access this health issue, use the [Database Center](https://docs.cloud.google.com/database-center/docs/overview).
This is an AI-assisted dashboard that gives you a centralized view of
health issues for clusters.

## Before you begin

Before you begin to use the **High resource utilization** health issue, complete
the prerequisites in this section.

### Assign roles and permissions

To use Database Center to view and work with health issues, you
must be granted IAM permissions for
Database Center. For more information about getting these
permissions, see [Grant IAM permissions](https://docs.cloud.google.com/database-center/docs/set-up-database-center#grant-iam-permissions).

Also, for more information about IAM roles, see [IAM roles and permissions index](https://docs.cloud.google.com/iam/docs/understanding-roles) and [Manage access to projects, folders, and organizations](https://docs.cloud.google.com/iam/docs/granting-changing-revoking-access).

## View the health issue

To view the **High resource utilization** health issue, do the following:

1. In the Google Cloud console, go to the **All resources** page in Database Center.

   [All resources](https://console.cloud.google.com/database-center/resources)
2. Select the **Products** menu. In the **Products** dialog, do the following:

   1. Optional: If any products are selected, then clear them.

   2. In the **Memorystore** pane, select **Redis Cluster 7.0**.

   3. Click **Apply**.

3. Select the **Issues** menu. In the **Issues** dialog, do the following:

   1. Clear all selected issues.

   2. In the **Performance and capacity** pane, select the
      **High resource utilization** health issue.

   3. Click **Apply**. Database Center displays any clusters that
      have high resource utilization issues.

4. Click the issue, which appears next to the name of a cluster. The
   **High resource utilization** health issue opens in a separate pane.

   If the issue doesn't appear next to the cluster, then the resource utilization
   for the cluster isn't high.
5. To view detailed information about the health issue, click the expander arrow
   () in the pane.

## Address the health issue

To address the **High resource utilization** health issue, increase the
cluster's capacity. This gives the cluster more memory and processing power to
handle a larger volume of data or traffic. The capacity is determined by the
number of shards in the cluster and the cluster's node type.

By [scaling the cluster](https://docs.cloud.google.com/memorystore/docs/cluster/about-scaling-instance-capacity),
your application can handle an increased demand without performance degradation.
To scale the cluster, either [add shards to the cluster](https://docs.cloud.google.com/memorystore/docs/cluster/scale-instance-capacity#scale_the_shard_count) or [change the cluster's node type to a larger node type](https://docs.cloud.google.com/memorystore/docs/cluster/scale-instance-capacity#scale_the_node_type).

## What's next

- [About scaling cluster capacity](https://docs.cloud.google.com/memorystore/docs/cluster/about-scaling-instance-capacity)
- [Scale cluster capacity](https://docs.cloud.google.com/memorystore/docs/cluster/scale-instance-capacity)