Michelle Sullivan
http://www.mhix.org/
Sent from my iPad
> On 09 May 2019, at 21:02, Dimitry Andric <d...@freebsd.org> wrote:
>
>> 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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