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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