On Mon, Oct 18, 2010 at 2:34 PM, Edward Ned Harvey <sh...@nedharvey.com> wrote: >> From: zfs-discuss-boun...@opensolaris.org [mailto:zfs-discuss- >> boun...@opensolaris.org] On Behalf Of Freddie Cash >> >> If you lose 1 vdev, you lose the pool. > > As long as 1 vdev is striped and not mirrored, that's true. > You can only afford to lose a vdev, if your vdev itself is mirrored. > > You could, for example, create 2 vdev's of raidz2, and instead of striping > them together, mirror them. Then you could lose one of the raidz2's, and > the other half of the mirror is still up.
Can you layer vdevs hierarchically? Last time I looked, you couldn't do that. Regardless, if you want to survive vdev loss, you probably want to set copies=2 on your data (or 3 if you're exceptionally paranoid), which could be thought of as another layer of mirroring. (And you can do this just on the datasets you really want to keep safe, you don't have to do it on the whole pool.) -- -Peter Tribble http://www.petertribble.co.uk/ - http://ptribble.blogspot.com/ _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
