zpool scrub 9TB finishes in ~40 mins

[Mariusz Zaborski]

Probably because:
https://github.com/zfsonlinux/zfs/pull/6256/commits/1c6275b1fcdacd734bb4eefd02a123b6b610ca48

FreeBSD commit - r334844.


On Fri, Nov 02, 2018 at 02:21:28PM +0100, Miroslav Lachman wrote:
> Andy Farkas wrote on 2018/11/02 13:07:
> 
> > # zpool status z
> >    pool: z
> >   state: ONLINE
> > status: One or more devices has experienced an error resulting in data
> >      corruption.  Applications may be affected.
> > action: Restore the file in question if possible.  Otherwise restore the
> >      entire pool from backup.
> >     see: http://illumos.org/msg/ZFS-8000-8A
> >    scan: scrub in progress since Fri Nov  2 16:59:24 2018
> >      365G scanned out of 11.9T at 228M/s, 14h47m to go
> >          2.47M repaired, 2.99% done
> 
> I definitely need this speed of scrub! 238M/s is awesome.
> I have RAIDZ from 4x ST4000VN000-1H4168 SC43 and the speed of scrub is 
> about 20MB/s.
> 
> Scrub takes more than week to finish:
> 
>    pool: tank0
>   state: ONLINE
> status: Some supported features are not enabled on the pool. The pool can
>          still be used, but some features are unavailable.
> action: Enable all features using 'zpool upgrade'. Once this is done,
>          the pool may no longer be accessible by software that does not 
> support
>          the features. See zpool-features(7) for details.
>    scan: scrub repaired 0 in 262h56m with 0 errors on Sun Sep 16 
> 02:04:25 2018
> config:
> 
>          NAME                STATE     READ WRITE CKSUM
>          tank0               ONLINE       0     0     0
>            raidz1-0          ONLINE       0     0     0
>              gpt/disk0tank0  ONLINE       0     0     0
>              gpt/disk1tank0  ONLINE       0     0     0
>              gpt/disk2tank0  ONLINE       0     0     0
>              gpt/disk3tank0  ONLINE       0     0     0
> 
> This is on HP ProLiant ML 110 G5 (very old machine) with only 5GB of RAM.
> 
> Miroslav Lachman
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-- 
Mariusz Zaborski
oshogbo//vx		| http://oshogbo.vexillium.org
FreeBSD committer	| https://freebsd.org
Software developer	| http://wheelsystems.com
If it's not broken, let's fix it till it is!!1
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