... > > Now it seems to me that without parity/replication, > there's not much > > point in doing the scrubbing, because you could > just wait for the error > > to be detected when someone tries to read the data > for real. It's > > only if you can repair such an error (before the > data is needed) that > > such scrubbing is useful. > > Pretty much
I think I've read (possibly in the 'MAID' descriptions) the contention that at least some unreadable sectors get there in stages, such that if you catch them early they will be only difficult to read rather than completely unreadable. In such a case, scrubbing is worthwhile even without replication, because it finds the problem early enough that the disk itself (or higher-level mechanisms if the disk gives up but the higher level is more persistent) will revector the sector when it finds it difficult (but not impossible) to read. - bill This message posted from opensolaris.org _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
