# Managing the NVMe cache
<a name="nvme-cache"></a>

The NVMe cache is enabled by default on your second-generation file system. If your second-generation file system has a throughput-heavy workload, you can disable the NVMe cache to improve performance. The following procedure explains how to enable, disable, and validate your file system's NVMe cache.

**To manage the NVMe cache**

1. SSH into your ONTAP file system. For more information, see [Using the NetApp ONTAP CLI](managing-resources-ontap-apps.md#netapp-ontap-cli).

   ```
   ssh fsxadmin@file-system-management-endpoint-ip-address
   ```

1. Use the [https://docs.netapp.com/us-en/ontap-cli-9131/system-node-external-cache-modify.html](https://docs.netapp.com/us-en/ontap-cli-9131/system-node-external-cache-modify.html) ONTAP CLI commnd. Choose **true** to enable the NVMe cache or **false** to disable it.

   ```
   ::> system node external-cache modify -node * -is-enabled [true|false]
   ```

1. Use the [https://docs.netapp.com/us-en/ontap-cli-9131/system-node-external-cache-show.html](https://docs.netapp.com/us-en/ontap-cli-9131/system-node-external-cache-show.html) ONTAP CLI command to check if the NVMe cache is enabled or disabled.

   ```
   ::> system node external-cache show -node * -fields is-enabled
   ```

The NVMe cache is enabled or disabled on a per-node basis. When you add new high-availability (HA) pairs to your file system, each new node has the same default behavior of a new file system's nodes. Therefore, the NVMe cache would be enabled for any new nodes on a file system even if the existing nodes have it disabled. For more information, see [Adding high-availability (HA) pairs](adding-HA-pairs.md).