On Wed, 18 Aug 2004 14:56:50 -0500 (CDT), Nate Carlson <natecars at real-time.com> wrote: > On Wed, 18 Aug 2004, smac at visi.com wrote: > > It depends on whose raid controller you are using. > > > > If it's a newer HP/Compaq controller you can have 2 drives fail replace > > the failed drives one at a time "HOT" and not miss a read or write. > > Huh? > > RAID5 means 1 parity drive, so if two drives fail and you don't have a hot > spare (or if the second drive fails before the spare has been fully > brought into service), you will (by definition) lose the array. Doesn't > matter who made the controllers. > > Or are you talking about RAID6, where you have two parity drives? Actually, according to this site <http://www.acnc.com/04_01_05.html>, RAID5 is distributed parity. Perhaps this is vendor-specific though. Effectively, this leads to "one parity drive". (X drives of size N results in X parity slices of size N/X, one per drive, which results in usable storage space equivalent to XN - N .) John _______________________________________________ TCLUG Mailing List - Minneapolis/St. Paul, Minnesota Help beta test TCLUG's potential new home: http://plone.mn-linux.org Got pictures for TCLUG? Beta test http://plone.mn-linux.org/gallery tclug-list at mn-linux.org https://mailman.real-time.com/mailman/listinfo/tclug-list