On Mon, Jan 29, 2007 at 09:37:57PM -0500, David Magda wrote: > On Jan 29, 2007, at 20:27, Toby Thain wrote: > > >On 29-Jan-07, at 11:02 PM, Jason J. W. Williams wrote: > > > >>I seem to remember the Massive Array of Independent Disk guys ran > >>into > >>a problem I think they called static friction, where idle drives > >>would > >>fail on spin up after being idle for a long time: > > > >You'd think that probably wouldn't happen to a spare drive that was > >spun up from time to time. In fact this problem would be (mitigated > >and/or) caught by the periodic health check I suggested. > > What about a rotating spare? > > When setting up a pool a lot of people would (say) balance things > around buses and controllers to minimize single points of failure, > and a rotating spare could disrupt this organization, but would it be > useful at all?
Agami Systems has the concept of "Enterprise Sparing", where the hot spare is distributed amongst data drives in the array. When a failure occurs, the rebuild occurs in parallel across _all_ drives in the array: http://www.issidata.com/specs/agami/enterprise-classreliability.pdf -- albert chin ([EMAIL PROTECTED]) _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
