Managing the NVMe cache

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.

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

2. Use the system node external-cache modify 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]

3. Use the system node external-cache show 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.