Hi Robert,
I just want to be clear that you can't just remove a disk from an
exported pool without penalty upon import:
- If the underlying redundancy of the original pool doesn't support
it and you lose data
- Some penalty exists even for redundant pools, which is running
in DEGRADED mode until you put the disk back
Cindy
Robert Milkowski wrote:
Hello Cindy,
Thursday, April 26, 2007, 8:57:54 PM, you wrote:
CSSC> Nenad,
CSSC> I've seen this solution offered before, but I would not recommend this
CSSC> except as a last resort, unless you didn't care about the health of
CSSC> the original pool.
CSSC> Removing a device from an exported pool, could be very bad, depending
CSSC> on the pool's redundancy. You might not get your all data back unless
CSSC> you put the disk back.
CSSC> See the output below.
CSSC> Definitely not for a pool and data on a production system.
CSSC> Cindy
CSSC> # zpool status epool
CSSC> pool: epool
CSSC> state: ONLINE
CSSC> scrub: none requested
CSSC> config:
CSSC> NAME STATE READ WRITE CKSUM
CSSC> epool ONLINE 0 0 0
CSSC> mirror ONLINE 0 0 0
CSSC> c7t6d0 ONLINE 0 0 0
CSSC> c7t5d0 ONLINE 0 0 0
CSSC> c5t5d0 ONLINE 0 0 0
CSSC> c6t6d0 ONLINE 0 0 0
CSSC> c6t5d0 ONLINE 0 0 0
CSSC> c6t7d0 ONLINE 0 0 0
CSSC> errors: No known data errors
CSSC> # cfgadm | grep c6t7d0
CSSC> sata4/7::dsk/c6t7d0 disk connected configured ok
CSSC> # zpool export epool
CSSC> # cfgadm -c unconfigure sata4/7
CSSC> Unconfigure the device at:
CSSC> /devices/[EMAIL PROTECTED],0/pci1022,[EMAIL PROTECTED]/pci11ab,[EMAIL
PROTECTED]:7
CSSC> This operation will suspend activity on the SATA device
CSSC> Continue (yes/no)? y
CSSC> # zpool import epool
CSSC> # zpool status epool
CSSC> pool: epool
CSSC> state: DEGRADED
CSSC> status: One or more devices could not be opened. Sufficient replicas
CSSC> exist for
CSSC> the pool to continue functioning in a degraded state.
CSSC> action: Attach the missing device and online it using 'zpool online'.
CSSC> see: http://www.sun.com/msg/ZFS-8000-D3
CSSC> scrub: resilver completed with 0 errors on Thu Apr 26 11:38:21 2007
CSSC> config:
CSSC> NAME STATE READ WRITE CKSUM
CSSC> epool DEGRADED 0 0 0
CSSC> mirror DEGRADED 0 0 0
CSSC> c7t6d0 ONLINE 0 0 0
CSSC> c7t5d0 ONLINE 0 0 0
CSSC> c5t5d0 ONLINE 0 0 0
CSSC> c6t6d0 ONLINE 0 0 0
CSSC> c6t5d0 ONLINE 0 0 0
CSSC> c6t7d0 UNAVAIL 0 0 0 cannot open
CSSC> errors: No known data errors
CSSC> #
What's wrong with above? It's perfectly normal and in such a config
it's definitely safe (there're still 5 copies of valid data).
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