Date: Wed, 26 Nov 2008 12:24:22 +0100 From: Goran Lowkrantz <glz@hidden-powers.com> To: Andriy Gapon <avg@icyb.net.ua>, freebsd-fs@freebsd.org Subject: Re: endless zpool scrub? Message-ID: <EE062959DAD52243C84A2EED@syn> In-Reply-To: <492D2122.4050203@icyb.net.ua> References: <492D2122.4050203@icyb.net.ua>
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--On November 26, 2008 12:12:50 +0200 Andriy Gapon <avg@icyb.net.ua> wrote:
>
> I noticed that zpool scrub on a certain pool runs "like forever".
> I decided to monitor its progress using periodic zpool status command,
> once in 10 seconds.
> Here's a snippet from the capture around an interesting point.
> Please notice two highlighted reports ('oops').
> This is stable/7.
> Thank you in advance for insights/comments.
>
>
> pool: tank
> state: ONLINE
> scrub: scrub in progress, 78.87% done, 0h31m to go
> config:
>
> NAME STATE READ WRITE CKSUM
> tank ONLINE 0 0 0
> ad6s2d ONLINE 0 0 0
>
> errors: No known data errors
> pool: tank
> state: ONLINE
> scrub: scrub in progress, 78.94% done, 0h31m to go
> config:
>
> NAME STATE READ WRITE CKSUM
> tank ONLINE 0 0 0
> ad6s2d ONLINE 0 0 0
>
> errors: No known data errors
> pool: tank
> state: ONLINE
> scrub: scrub in progress, 78.97% done, 0h31m to go
> config:
>
> NAME STATE READ WRITE CKSUM
> tank ONLINE 0 0 0
> ad6s2d ONLINE 0 0 0
>
> errors: No known data errors
> pool: tank
> state: ONLINE
> scrub: scrub in progress, 0.00% done, 233h25m to go
> config:
>
> NAME STATE READ WRITE CKSUM
> tank ONLINE 0 0 0
> ad6s2d ONLINE 0 0 0
> ****oops, went back to 0%****
>
> errors: No known data errors
> pool: tank
> state: ONLINE
> scrub: scrub in progress, 0.00% done, 259h47m to go
> config:
>
> NAME STATE READ WRITE CKSUM
> tank ONLINE 0 0 0
> ad6s2d ONLINE 0 0 0
>
> errors: No known data errors
> pool: tank
> state: ONLINE
> scrub: scrub in progress, 0.00% done, 186h50m to go
> config:
>
> NAME STATE READ WRITE CKSUM
> tank ONLINE 0 0 0
> ad6s2d ONLINE 0 0 0
>
> errors: No known data errors
> pool: tank
> state: ONLINE
> scrub: scrub in progress, 0.00% done, 186h45m to go
> config:
>
> NAME STATE READ WRITE CKSUM
> tank ONLINE 0 0 0
> ad6s2d ONLINE 0 0 0
>
> errors: No known data errors
> pool: tank
> state: ONLINE
> scrub: scrub in progress, 0.00% done, 306h30m to go
> config:
>
> NAME STATE READ WRITE CKSUM
> tank ONLINE 0 0 0
> ad6s2d ONLINE 0 0 0
>
> errors: No known data errors
> pool: tank
> state: ONLINE
> scrub: scrub in progress, 0.00% done, 292h19m to go
> config:
>
> NAME STATE READ WRITE CKSUM
> tank ONLINE 0 0 0
> ad6s2d ONLINE 0 0 0
>
> errors: No known data errors
> pool: tank
> state: ONLINE
> scrub: scrub in progress, 0.00% done, 231h16m to go
> config:
>
> NAME STATE READ WRITE CKSUM
> tank ONLINE 0 0 0
> ad6s2d ONLINE 0 0 0
>
> errors: No known data errors
> pool: tank
> state: ONLINE
> scrub: scrub in progress, 0.00% done, 283h55m to go
> config:
>
> NAME STATE READ WRITE CKSUM
> tank ONLINE 0 0 0
> ad6s2d ONLINE 0 0 0
>
> errors: No known data errors
> pool: tank
> state: ONLINE
> scrub: scrub in progress, 0.00% done, 232h8m to go
> config:
>
> NAME STATE READ WRITE CKSUM
> tank ONLINE 0 0 0
> ad6s2d ONLINE 0 0 0
>
> errors: No known data errors
> pool: tank
> state: ONLINE
> scrub: scrub in progress, 0.00% done, 164h37m to go
> config:
>
> NAME STATE READ WRITE CKSUM
> tank ONLINE 0 0 0
> ad6s2d ONLINE 0 0 0
>
> errors: No known data errors
> pool: tank
> state: ONLINE
> scrub: scrub in progress, 0.00% done, 183h40m to go
> config:
>
> NAME STATE READ WRITE CKSUM
> tank ONLINE 0 0 0
> ad6s2d ONLINE 0 0 0
>
> errors: No known data errors
> pool: tank
> state: ONLINE
> scrub: scrub in progress, 0.00% done, 166h21m to go
> config:
>
> NAME STATE READ WRITE CKSUM
> tank ONLINE 0 0 0
> ad6s2d ONLINE 0 0 0
>
> errors: No known data errors
> pool: tank
> state: ONLINE
> scrub: scrub stopped with 0 errors on Wed Nov 26 12:02:02 2008
> config:
>
> NAME STATE READ WRITE CKSUM
> tank ONLINE 0 0 0
> ad6s2d ONLINE 0 0 0
> ****oops, scrub is reported as stopped****
>
> errors: No known data errors
> pool: tank
> state: ONLINE
> scrub: scrub in progress, 0.00% done, 127h29m to go
> config:
>
> NAME STATE READ WRITE CKSUM
> tank ONLINE 0 0 0
> ad6s2d ONLINE 0 0 0
>
> errors: No known data errors
>
Do you have a script or something that creates snapshots running?
I used sysutils/zfs-snapshot-mgmt and did see the same as you, as a running
scrub is reset by a snapshot creation.
If you are using this script, we have tested a modified version that
suspends snapshot creation on a pool that is scrubbing.
/glz
---
"There is hopeful symbolism in the fact that flags do not wave in a vacuum."
-- Arthur C. Clarke
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