ZFS Log and Cache on sliced disks

Having two SSD disks in a FreeNAS (w. ZFS) storage system, I wanted to test log and cache. To avoid using 120GB SSD for the log-device (which only needs 1-2GB) I decided to slice the disks, and use the rest for l2arch cache. First, let’s partition the two disks (ad14 + ad15 in my case):

# gpart create -s GPT da14
da14 created
# gpart create -s GPT da15
da15 created

Next, we will slice the two disks with 1 slice for log and 1 slice for cache:

# gpart add -t freebsd-zfs -l log0 -s 2G da14
da14p1 added
# gpart add -t freebsd-zfs -l log1 -s 2G da15
da15p1 added
# gpart add -t freebsd-zfs -l cache0 da14
da14p2 added
# gpart add -t freebsd-zfs -l cache1 da15
da15p2 added

And finaly we can add those to the ZFS pool (zpool0 in my case):

# zpool add zpool0 log /dev/gpt/log*
# zpool add zpool0 cache /dev/gpt/cache*

Running zpool status will show us the newly created log and cache devices:

# zpool status
  pool: zpool0
 state: ONLINE
  scan: none requested
config:

    NAME                                            STATE     READ WRITE CKSUM
    zpool0                                          ONLINE       0     0     0
      raidz2-0                                      ONLINE       0     0     0
        gptid/ad31f70d-6b8e-11e2-9c22-003048d536d4  ONLINE       0     0     0
        gptid/adc6b13f-6b8e-11e2-9c22-003048d536d4  ONLINE       0     0     0
        gptid/ae5a9734-6b8e-11e2-9c22-003048d536d4  ONLINE       0     0     0
        gptid/aef01f30-6b8e-11e2-9c22-003048d536d4  ONLINE       0     0     0
        gptid/af84e554-6b8e-11e2-9c22-003048d536d4  ONLINE       0     0     0
        gptid/b01b94af-6b8e-11e2-9c22-003048d536d4  ONLINE       0     0     0
        gptid/b0b36854-6b8e-11e2-9c22-003048d536d4  ONLINE       0     0     0
        gptid/b1462c16-6b8e-11e2-9c22-003048d536d4  ONLINE       0     0     0
        gptid/b1e0f4d9-6b8e-11e2-9c22-003048d536d4  ONLINE       0     0     0
        gptid/b272b495-6b8e-11e2-9c22-003048d536d4  ONLINE       0     0     0
        gptid/b30df080-6b8e-11e2-9c22-003048d536d4  ONLINE       0     0     0
        gptid/b3a4ebfd-6b8e-11e2-9c22-003048d536d4  ONLINE       0     0     0
        gptid/b3ede887-6b8e-11e2-9c22-003048d536d4  ONLINE       0     0     0
    logs
      gpt/log0                                      ONLINE       0     0     0
      gpt/log1                                      ONLINE       0     0     0
    cache
      gpt/cache0                                    ONLINE       0     0     0
      gpt/cache1                                    ONLINE       0     0     0

errors: No known data errors