Date: Wed, 7 Jun 2017 12:56:30 +0200 From: =?UTF-8?Q?=c5=81ukasz_W=c4=85sikowski?= <lukasz@wasikowski.net> To: Stephen McKay <mckay@FreeBSD.org> Cc: freebsd-fs@freebsd.org Subject: Re: Problem with zpool remove of log device Message-ID: <4df1ea6d-148e-f3ab-d204-9277c513a468@wasikowski.net> In-Reply-To: <0410af$1dldvp4@ipmail04.adl6.internode.on.net> References: <9188a169-cd81-f64d-6b9e-0e3c6b4af1bb@wasikowski.net> <0410af$1dldvp4@ipmail04.adl6.internode.on.net>
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W dniu 2017-06-07 o 10:21, Stephen McKay pisze:
> On Friday, 26th May 2017, lukasz@wasikowski.net wrote:
>
>> I cant remove log device from pool - operation ends ok, but log device
>> is still in the pool (bug?).
>>
>> # uname -a
>> FreeBSD xxx.yyy.com 11.0-STABLE FreeBSD 11.0-STABLE #0 r316543: Thu Apr
>> 6 08:22:43 CEST 2017 root@xxx.yyy.com:/usr/obj/usr/src/sys/YYY amd64
>>
>> # zpool status tank
>> [..snip..]
>>
>> NAME STATE READ WRITE CKSUM
>> tank ONLINE 0 0 0
>> mirror-0 ONLINE 0 0 0
>> ada2p3 ONLINE 0 0 0
>> ada3p3 ONLINE 0 0 0
>> logs
>> mirror-1 ONLINE 0 0 0
>> gpt/tankssdzil0 ONLINE 0 0 0 block size: 512B configured, 4096B native
>> gpt/tankssdzil1 ONLINE 0 0 0 block size: 512B configured, 4096B native
>
>> When I try to remove log device operation ends without errors:
>>
>> # zpool remove tank mirror-1; echo $?
>> 0
>>
>> But the log device is still there:
>> [..snip..]
>> I'd like to remove it - how should I proceed?
>
> Does your system still write to the log? Use "zfs iostat -v 1" to
> check. I think it is probably no longer be in use and only the final
> disconnection failed.
zpool iostat -v 1 shows no activity on the log drive. I tried to remove
it after booting to livecd - no luck.
> What does "zpool list -v" tell you? If you have a non-zero ALLOC
> column for your log mirror and the log is no longer being used then
> you may have hit an accounting bug in zfs that the zfsonlinux people
> ran into a while ago.
This can be it:
# zpool list -v
NAME SIZE ALLOC FREE EXPANDSZ FRAG CAP DEDUP
HEALTH ALTROOT
tank 1.80T 1.55T 251G - 64% 86% 1.00x
ONLINE -
mirror 1.80T 1.55T 251G - 64% 86%
ada2p3 - - - - - -
ada3p3 - - - - - -
log - - - - - -
gpt/tankssdzil1 4.97G 142M 4.83G - 0% 2%
> I had this problem when I tried to remove a log mirror from a pool
> I have been using for years. I solved it by tweaking the zfsonlinux
> hack a bit and slotting it into 9.3.
Thank you for this info. It seems that it's no longer an issue for me -
this box will be soon retired. I'll move some data from it and wipe it down.
--
best regards,
Lukasz Wasikowski
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