On 9 May 2019, at 10:32, Miroslav Lachman <000.f...@quip.cz> wrote:
> 
> Patrick M. Hausen wrote on 2019/05/09 09:46:
>> Hi all,
>>> Am 09.05.2019 um 00:55 schrieb Michelle Sullivan <miche...@sorbs.net>:
>>> No, one disk in the 16 disk zRAID2 ...  previously unseen but it could be 
>>> the errors have occurred in the last 6 weeks... everytime I reboot it 
>>> started resilvering, gets to 761M resilvered and then stops.
>> 16 disks in *one* RAIDZ2 vdev? That might be the cause of your insanely
>> long scrubs. In general it is not recommended though I cannot find the
>> source for that information quickly just now.
> 
> Extremely slow scrub is an issue even on 4 disks RAIDZ. I already posted 
> about it in the past. This scrub is running from Sunday 3AM.
> Time to go is big lie. Is was "19hXXm" 12 hour ago.
> 
>  pool: tank0
> state: ONLINE
>  scan: scrub in progress since Sun May  5 03:01:48 2019
>        10.8T scanned out of 12.7T at 30.4M/s, 18h39m to go
>        0 repaired, 84.72% done
> 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
> 
> Disks are OK, monitored by smartmontools. There is nothing odd, just the long 
> long scrubs. This machine was started with 4x 1TB (now 4x 4TB) and scrub was 
> slow with 1TB disks too. This machine - HP ML110 G8) was my first machine 
> with ZFS. If I remember it well it was FreeBSD 7.0, now running 11.2. Scrub 
> was / is always about one week. (I tried some sysctl tuning without much gain)

Unfortunately https://svnweb.freebsd.org/changeset/base/339034, which
greatly speeds up scrubs and resilvers, was not in 11.2 (since it was
cut at r334458).

If you could update to a more recent snapshot, or try the upcoming 11.3
prereleases, you will hopefully see much shorter scrub times.

-Dimitry

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