How to enable flash cache for storage pool

Connect to console

    $ ssh [email protected]
    Warning: Permanently added '192.168.1.x' (ECDSA) to the list of known hosts.
    Password:

Check the storage cache status

    Welcome to the Cube Appliance
    Enter "help" for a list of available commands
    controller> storage
    controller:storage> cache
    controller:cache> status
    STATUS: off

Promote a SSD disk as cache

    controller:cache> promote_disk
      index          name      size   storage ids
    --
          1      /dev/sdb    238.5G           0 1
          2      /dev/sdc    931.5G           2 3
    --
    Enter the index to promote: 1

Enable cache

    controller:cache> switch
    Current cache status: off
    Turn on/off the cache(on/off): on

Check the result

    controller:cache> status
    STATUS: on
    USED SIZE
    --
    0.34 223GiB
    --