Hi, thanks for your response, I didn't notice it at first because it only went to the mailing list :)
On Wed, Aug 25, 2004 at 12:08:53PM +0200, Christian Laursen wrote: > Stijn Hoop <[EMAIL PROTECTED]> writes: > > I was wondering about the vinum 'rebuildparity' command, especially the > > times when one needs to use this. > > I run rebuildparity if checkparity finds any errors after unclean shutdowns. OK, that's what was adviced. > > The problem is that I can't find anything in the vinum docs about this > > command other than it's purpose. What I don't understand is the difference > > between reviving a disk in a RAID-5 plex, and rebuilding the parity. > > When reviving a disk the data on that disk is calculated from the data and the > parity on the other disks. Yes, but the parity should be recalculated at the same time, right? > I think rebuildparity only reads data and writes the parity calculated > from that but for all disks. OK, that would seem logical. > > When I start a degraded disk it starts to revive -- which led me to believe > > that vinum was also recalculating the parity. Evidently it wasn't. > > I'm therefore now updating my procedures to always run > > 'checkparity -v <plex>' after a disk crash. > > That shouldn't be neccesary. Well, it appears to be. checkparity found some errors in the parity after a single disk crash & rebuild (ie degraded mode -> start subdisk -> revive process complete). If this is not the expected behaviour it means something about the controller has blown; we do get lots of unexpected read/write errors which always turn out to be false alarms upon further inspection. Maybe a controller has turned bad :( FWIW, the rebuildparity helped, the parity is now again correct. --Stijn -- "Harry, I'm going to let you in on a little secret. Every day, once a day, give yourself a present. Don't plan it, don't wait for it, just let it happen. Could be a new shirt at the men's store, a catnap in your office chair, or... two cups of good, hot, black coffee. Like this." -- Special Agent Dale Cooper, "Twin Peaks"
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