On Thu, May 9, 2019 at 5:37 AM Miroslav Lachman <[email protected]> wrote: > > Dimitry Andric wrote on 2019/05/09 13:02: > > On 9 May 2019, at 10:32, Miroslav Lachman <[email protected]> wrote: > > [...] > > >> 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. > > Thank you. I will try 11-STABLE / 11.3-PRERELEASE soon and let you know > about the difference. > > Kind regards > Miroslav Lachman
On 11.3 and even much older releases, you can greatly speed up scrub and resilver by tweaking some sysctls. If you have spinning rust, raise vfs.zfs.top_maxinflight so they'll do fewer seeks. I used to set it to 8192 on machines with 32GB of RAM. Raising vfs.zfs.resilver_min_time_ms to 5000 helps a little, too. -Alan _______________________________________________ [email protected] mailing list https://lists.freebsd.org/mailman/listinfo/freebsd-stable To unsubscribe, send any mail to "[email protected]"
