On 2012-04-24 19:14, Tim Cook wrote:
Personally unless the dataset is huge and you're using z3, I'd be scrubbing once a week. Even if it's z3, just do a window on Sunday's or something so that you at least make it through the whole dataset at least once a month.
+1 I guess Among other considerations, if the scrub does find irrepairable errors, you might have some recent-enough backups or other sources of the data, so the situation won't be as fatal as when you look for errors once a year ;)
There's no reason NOT to scrub that I can think of other than the overhead - which shouldn't matter if you're doing it during off hours.
"I heard a rumor" that HDDs can detect reading flaky sectors (i.e. detect a bit-rot error and recover thanks to ECC), and in this case they would automatically remap the revocered sector. So reading the disks in (logical) locations where your data is known to be may be a good thing to prolong its available life. This of course relies kinda on disk reliability - i.e. it should be rated 24/7 and within warranted age (mechanics should be within acceptable wear). No guarantees with other drives, although I don't think weekly scrubs would be fatal. If only ZFS could queue scrubbing reads more linearly... ;) //Jim _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
