> > According to the ZFS documentation, a resilver operation > >includes what is effectively a dirty region log (DRL) so that if the > >resilver is interrupted, by a snapshot or reboot, the resilver can > >continue where it left off. > > That is not the case. The dirty region log keeps track of what time > periods a device was offline, so that if a device is goes offline and comes > back soon thereafter, only the recent data needs to be resilvered.
And for that reason we call it the Dirty Time Log (DTL) rather than DRL. This is efficient because actual device outages are temporal, not spatial. As a rule, a 5-minute outage can be fully resilvered in 5 minutes or less. Jeff _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
