Bob Friesenhahn wrote: > On Sun, 18 Jan 2009, Tim wrote: > >> Honestly, I believe this list... when other people have asked if they can >> use the copies= to avoid mirroring everything. I can't say I've saved any >> of the threads because they didn't seem of any particular importance to me >> at the time. > > The extra copies help avoid data loss, but if a disk is lost and there > is no disk-wise redundancy, then the pool will be lost.
I'm reading a lot of posts where folks don't seem to be understanding each other, so let me try and re-phrase things. If you set copies=n, where n > 1, ZFS will _attempt_ to put the copies on different block devices. If it can't, it will _attempt_ to place the copies "far" away from each other on the same block device. The key word above is "attempt". Previous posters have shot this down for "poor man's mirroring" because of the lack of guarantees. I suspect these naysayers (and rightly so) are what Tim is recalling. -- Carson _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
