Add a caching drive to a storage pool

Prerequisites

Before you can add a caching drive to a storage pool, pool caching must have been configured when you installed Portworx on your cluster. Refer to the Install Portworx with caching enabled section for more details.

Add a caching drive to a storage pool

Perform the following steps to add a caching drive to a storage pool:

1. Enter maintenance mode:

   pxctl service maintenance --enter

   This is a disruptive operation, PX will restart in maintenance mode.
   Are you sure you want to proceed ? (Y/N): y
   Entering Maintenance mode...

2. Enter the pxctl service drive add command, specifying:

• The --drive option with the <drive_path> of your caching drive

• The --cache option with the <pool_id> of the pool you want to add the caching drive to

  pxctl service drive add --drive <drive_path> --cache <pool_id>

  The following example adds a caching drive at the /dev/sdc path to a pool with an ID of 0:

  pxctl service drive add --drive /dev/sdc --cache 0

3. Adding a drive is a long-running operation, and Portworx won't exit from the maintenance mode while the operation is still running. Therefore, you must verify that the drive has been added successfully by entering the pxctl service drive add command with the following parameters:

• The --drive option with the <drive_path> of your caching drive

• The --cache option with the <pool_id> of the pool you want to verify

• The --operation option with the status value

  pxctl service drive add --drive <drive_path> --cache <pool_id> --operation status

  The following example verifies that a caching drive /dev/sdc has been added to pool 0:

  pxctl service drive add --drive /dev/sdc --cache 0 --operation status

4. Exit maintenance mode:

   pxctl service maintenance --exit

   Exiting Maintenance mode...