Hey ZFS crew ... do you want to jump in and help answer these questions?
On 11/19/07 04:13, Ross wrote: > Heya, > > This is a question based on a feature request I saw in the wiki: > http://www.genunix.org/wiki/index.php/OpenSolaris_Storage_Developer_Wish_List > > I'm a complete newbie to all this so didn't want to clutter the wiki with > questions, instead I've just added a quick link to here. Hope that's ok. > > I've love to see prioritised resilvering, but I've read that snapshots can't > be taken while resilvering is in progress, or that taking a snapshot restarts > the resilvering? (is this bug still current? > http://bugs.opensolaris.org/view_bug.do?bug_id=6343667). > > Are there plans to address that as part of this? We're planning to use > automated snapshots on a thumper used as a SAN, so we don't want resilvering > to affect the users, but we definately want snapshots to continue while the > resilver operation is taking place. That's expecially important since > resilvering a 500MB drive could take some time, and our long term plans > involve using resilvering to upgrade to 2TB or even 4TB disks. > > Also, would it be possible to set multiple priority levels for this? We're > planning to use dual parity raid, so if one disk fails I've no problem with > re-silvering at a steady rate with minimal impact on performance. However, > if two disks failed I would want the resilvering to proceed at a much more > aggressive pace. > > Would a sensible default be to have resilvering running at a lower priority > than other requests while the zpool is still in a redundant configuration, > but for the priority to automatically be placed higher than other requests if > data is at risk? > > And is there any way administrators would be able to set those rates on the > fly, in a relatively easy to understand fashion? If the zpool data was still > safe, I'd want to set the resilvering priority so we'd only loose 1/5 of our > maximum performance. If data were at risk though, I may want to set that as > high as 3/5 or 4/5. How hard would it be to let us configure this using > percentages of maximum performance instead of just setting priority levels? > > Also, since we're planning to use this to upgradea the thumper, and since > that means swopping out 48 disks, I'd want to be able to change the resilver > priority for a zpool on the fly. That would let us inform the users to > expect slower speeds for a while and increase the priority while the upgrade > takes place. > > And finally, could priorities be set on a zvol or filesystem basis? We'll be > building one huge pool on the thumper, but some systems will be more imporant > than others. If I could assign a global zpool priority, but tweak that for > each volume or filesystem, that would be superb. > > > This message posted from opensolaris.org > _______________________________________________ > storage-discuss mailing list > [EMAIL PROTECTED] > http://mail.opensolaris.org/mailman/listinfo/storage-discuss > _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
