On Aug 8, 2011, at 4:01 PM, Peter Jeremy wrote: > On 2011-Aug-08 17:12:15 +0800, Andrew Gabriel <andrew.gabr...@oracle.com> > wrote: >> periodic scrubs to cater for this case. I do a scrub via cron once a >> week on my home system. Having almost completely filled the pool, this >> was taking about 24 hours. However, now that I've replaced the disks and >> done a send/recv of the data across to a new larger pool which is only >> 1/3rd full, that's dropped down to 2 hours. > > FWIW, scrub time is more related to how fragmented a pool is, rather > than how full it is. My main pool is only at 61% (of 5.4TiB) and has > never been much above that but has lots of snapshots and a fair amount > of activity. A scrub takes around 17 hours.
Don't forget, scrubs are throttled on later versions of ZFS. In a former life, we did a study of when to scrub and the answer was about once a year for enterprise-grade storage. Once a week is ok for the paranoid. > > This is another area where the mythical block rewrite would help a lot. Maybe, by then I'll be retired and fishing somewhere, scaring the children with stories about how hard we had it back in the days when we stored data on spinning platters :-) -- richard _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
