So this is a point of debate that probably deserves being brought to the floor (probably for the umpteenth time, but indulge me). I've heard from several people that I'd consider "experts" that once per year scrubbing is sufficient, once per quarter is _possibly_ excessive, and once a week is downright overkill. Since scrub thrashes your disk, I'd like to avoid it if at all possible.
My opinion is that it depends on the data. If it's all data at rest, ZFS can't correct bit-rot if it's not read out on a regular interval. My biggest question on this? How often does bit-rot occur on media that isn't read or written to excessively, but just spinning most of the day and only has 10-20GB physically read from the spindles daily? We all know as data ages, it gets accessed less and less frequently. At what point should you be scrubbing that "old" data every few weeks to make sure a bit or two hasn't flipped? FYI - I personally scrub once per month. Probably overkill for my data, but I'm paranoid like that. -Matt -----Original Message----- How often do you normally run a scrub, before this happened? It's possible they were accumulating for a while but went undetected for lack of read attempts to the disk. Scrub more often! -- Dan. _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
