Date: Wed, 27 Sep 2017 13:17:24 +0200 From: Borja Marcos <borjam@sarenet.es> To: FreeBSD FS <freebsd-fs@freebsd.org> Subject: Problem with the periodic scrub of ZFS pools Message-ID: <BDF5D737-DF1A-431E-8928-9603AB2AD283@sarenet.es>
next in thread | raw e-mail | index | archive | help
Hi, There’s a problem with the periodic script for ZFS pool scrubbing (/etc/periodic/daily/800.scrub-zfs). It can be configured with an interval between scrubs (daily_scrub_zfs_default_threshold=“17”) but the feature depends on making searches in the pool history. In a very active ZFS pool (Mine has a lot of zfs dataset replications and there is a lot of zfs snapshot creation/deletion/replication the scrub entries will disappear (the history has a finite length). In my case, for example, I configured 17 days between scrubs, I actually get a weekly one. A better mechanism should be used to store the timestamp of the last automated scrub. Custom attributes are a good candidate, but zpool doesn’t have that option. What about adding it as a custom attribute to the root dataset of the pool? Ie, for a pool called “tank” we could use “zfs set freebsd_period:last_scrub=timestamp” or something slmilar. Ideas? Thanks! Borja.
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?BDF5D737-DF1A-431E-8928-9603AB2AD283>