So... Scrub isn't lightning fast
Op 30 sep. 2012 om 00:58 heeft Richard Elling <[email protected]> het volgende geschreven: > On Sep 27, 2012, at 5:15 PM, Reginald Beardsley <[email protected]> wrote: > >> --- On Thu, 9/27/12, Richard Elling <[email protected]> wrote: >>>> >>>> zfs_scrub_delay = 100 >>> >>> a bit extreme, but probably ok >>> >>>> zfs_scan_idle = 1000 >>> >>> no, you'll want to make this smaller. >> >> OK, Thanks. >> >>> Weekly scrubs are a bit extreme. Is your hardware unreliable >>> enough that you need >>> to scrub weekly? >> >> No reliability problems except for a 3 TB drive scratch drive that failed. >> I only discovered that when I was forced to reboot after a long power >> failure. Both Sol 10 U8 and OI 151 have endured several power losses due to >> bad UPS w/o a hiccup. > > It is not likely a scrub will detect this. scrubs are mostly good for > detecting > media problems and phantom writes. There are a whole bunch of other > failure modes (eg spinup) that scrubs won't exercise. > >> This is new territory. I've never had the ability to check the disk >> integrity before. So what is a sensible scrub schedule? Monthly? System >> runs 24x7 unless I lose power or a particularly big thunderstorm is coming >> through in which case I'll shut down and disconnect the cables. It's on a >> UPS, but I'm on a hill in a bunch of tall trees, so it can get pretty >> dramatic. A few days ago I lost 2 fluorescent light fixtures in my shop and >> Mom lost a cordless phone. > > Add lightning to the list of things scrub doesn't exercise :-) > > The scrub interval is determined by an acceptable risk of checking for > errors that scrub exercises. Scrubs will never offer 100% no-risk. > -- richard > > -- > illumos Day & ZFS Day, Oct 1-2, 2012 San Fransisco > www.zfsday.com > [email protected] > +1-760-896-4422 > > > > _______________________________________________ > OpenIndiana-discuss mailing list > [email protected] > http://openindiana.org/mailman/listinfo/openindiana-discuss _______________________________________________ OpenIndiana-discuss mailing list [email protected] http://openindiana.org/mailman/listinfo/openindiana-discuss
