On Fri, April 9, 2010 14:38, Harry Putnam wrote: > I happened to notice someones' config posted here recently where a > single zpool was made up of several mirror sets. > > From: Andreas Höschler <ahoe...@smartsoft.de> > Subject: Replacing disk in zfs pool > Newsgroups: gmane.os.solaris.opensolaris.zfs > To: zfs-discuss@opensolaris.org > Date: Fri, 9 Apr 2010 10:58:16 +0200 > Message-ID: <099e714d-43b6-11df-83fb-000393ca0...@smartsoft.de> > > I hadn't even thought of such a setup, but wonder now if that would > have been a better way to go.
Probably; unless you need different performance out of the two, or something. > My needs are small, and the zfs server acts mostly as NAS for home > lan. That's the job mine does; keeping all those photos, and a little music. > I've been thinking the mirrors on the zfs server were the final > stopping place for my backups. I'm thinking the mirrors are reliable > enough that I don't do even more backups of the backup zpools. > > I mean other than auto snapshots. > > I'm thinking a crippled mirror can be recovered rather than needing a > backup of it. And that short of 2 mirrored disks dieing at the same > time. I'm in pretty good shape. > > Am I way wrong on this, and further I'm curious if it would make more > versatile use of the space if I were to put the mirrored pairs into > one big pool containing 3 mirrored pairs (6 discs) Well, my own thinking doesn't consider that adequate for my own data; which is not identical to thinking you're actually "wrong", of course. Issues I see include: Flood, fire, foes, bugs, user error. "rm -rf /" will destroy your data just as well on the mirror as on a single disk, as will hacker breakins. OS and driver bugs can corrupt both sides of the mirror. And burning your house down, or flooding it perhaps (depending on where your server is; mine's in the basement, so if we flood, it gets wet), will destroy your data. I make and keep off-site backups, formerly on optical media, moving towards external disk drives. > So where they had been separate pools, where one might fill up while > another stayed fairly empty, if they were all in a single pool none > would fill up until they all filled up. Yes, that's the advantage. I'm running three mirror vdevs in one data pool. -- David Dyer-Bennet, d...@dd-b.net; http://dd-b.net/ Snapshots: http://dd-b.net/dd-b/SnapshotAlbum/data/ Photos: http://dd-b.net/photography/gallery/ Dragaera: http://dragaera.info _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
