Mesin SAN yang menggunakan Nexenta tiba-tiba off karena mati listrik dari PLN-nya (UPS fail), dan posisi DDR Drive (logzil) langsung off sebelum dia write data ke disk.
Cek zpool dari SSH
nmc@alengka:/$ zpool status
pool: alengka
state: FAULTED
status: An intent log record could not be read.
Waiting for adminstrator intervention to fix the faulted pool.
action: Either restore the affected device(s) and run 'zpool online',
or ignore the intent log records by running 'zpool clear'.
see: http://www.sun.com/msg/ZFS-8000-K4
scan: resilvered 1.50K in 0h0m with 0 errors on Wed Oct 24 19:32:34 2012
config:
NAME STATE READ WRITE CKSUM
alengka FAULTED 0 0 0 bad intent log
mirror-0 ONLINE 0 0 0
c0t3d0 ONLINE 0 0 0
c1t8d0 ONLINE 0 0 0
mirror-1 ONLINE 0 0 0
c0t0d0 ONLINE 0 0 0
c1t1d0 ONLINE 0 0 0
mirror-2 ONLINE 0 0 0
c0t5d0 ONLINE 0 0 0
c1t5d0 ONLINE 0 0 0
mirror-3 ONLINE 0 0 0
c0t11d0 ONLINE 0 0 0
c1t7d0 ONLINE 0 0 0
mirror-4 ONLINE 0 0 0
c0t10d0 ONLINE 0 0 0
c1t2d0 ONLINE 0 0 0
logs
c3t0d0 UNAVAIL 0 0 0 cannot open
Dari low level Nexenta
$ option expert_mode=1
$ !bash
You are about to enter the Unix ("raw") shell and execute low-level Unix command(s). Warning: using low-level Unix commands is not recommended! Execute? Yes
$ zpool clear alengka c3t0d0
$ zpool online alengka c3t0d0
Proses selanjutnya adalah resilvering, tunggu saja sampai finish dan statusnya kembali online
root@alengka:/volumes# zpool status -x
pool: alengka
state: DEGRADED
status: One or more devices is currently being resilvered. The pool will
continue to function, possibly in a degraded state.
action: Wait for the resilver to complete.
scan: resilver in progress since Sat Dec 14 01:59:11 2013
94.9G scanned out of 697G at 1.46G/s, 0h6m to go
0 resilvered, 13.62% done
root@alengka:/volumes# zpool status
pool: alengka
state: ONLINE
scan: resilvered 0 in 0h8m with 0 errors on Sat Dec 14 02:07:43 2013