i use for seeing how much my SLOG is i use zpool iostat -v
$ zpool iostat -v
capacity operations bandwidth
pool alloc free read write read write
----------------------------------------------- ----- ----- ----- ----- ----- -----
rpool 6.86G 152G 0 24 7.64K 283K
ata-OCZ-AGILITY3_OCZ-B8LCS0WQ7Z7Q89B6-part3 6.86G 152G 0 24 7.64K 283K
----------------------------------------------- ----- ----- ----- ----- ----- -----
zPool 13.4T 24.8T 78 369 7.03M 9.94M
raidz1 12.7T 14.6T 76 121 7.00M 1.84M
wwn-0x5000cca2556e97a8 - - 30 33 1.75M 469K
wwn-0x5000cca2556d51f4 - - 15 33 1.75M 469K
ata-HGST_HUS726060ALA640_AR11021EH21JAB - - 15 27 1.75M 472K
12046184624242064708 - - 0 0 0 0
wwn-0x5000cca232cedb71 - - 15 27 1.75M 472K
raidz1 777G 10.1T 2 149 38.6K 4.47M
ata-TOSHIBA_DT01ACA300_531RH5DGS - - 0 36 9.89K 1.13M
ata-TOSHIBA_DT01ACA300_Z252JW8AS - - 0 36 9.51K 1.11M
ata-TOSHIBA_DT01ACA300_99QJHASCS - - 0 39 9.69K 1.13M
ata-TOSHIBA_DT01ACA300_99PGNAYCS - - 0 37 9.54K 1.11M
logs - - - - - -
ata-OCZ-AGILITY3_OCZ-B8LCS0WQ7Z7Q89B6-part5 80.3M 4.42G 0 98 843 3.63M
cache - - - - - -
ata-Crucial_CT750MX300SSD1_161613125282-part1 189G 411G 2 32 73.4K 3.68M
----------------------------------------------- ----- ----- ----- ----- ----- -----
excuse the mess of random disk identifiers used to add the drives, but it was what i could get working at the time, still getting the hang of this zfs thing.
rpool is the OS
zPool is storage… really should get that renamed… the capital P is kinda driving me crazy, if i wasn’t to begin with… jury is still out xD
and yes i’m a drive down… working on that
iostat is pretty great… slow because it’s avg over a long period, but pretty great for getting a good sense of how the pool is performing.
thus far i found -v -l -w