On Mon, Mar 30, 2009 at 4:13 PM, Michael Shadle <mike...@gmail.com> wrote:
> Well basically I am trying to analyze giving up 1/7th of my space for > the off chance that one drive fails during resilvering. I just don't > know what kind of time to expect for a resilver. I'm sure it also > depends on the build of nevada too and various bugs... > > Normally it seems like raid5 is perfectly fine for a workoad like this > but maybe I'd sleep better at night knowing I could have 2 disks fail, > but the odds of that are pretty slim. I've never had 2 disks fail, and > if I did, the whole array is probably failed / the actual unit itself > got damaged, and then probably more than the 2 disks have been > destroyed anyway. > > Looks like there are two open requests for speeding up and slowing > down the resilvering process already. So it does not sound like you > can tune it. But it would be nice to have some sort of number to > expect. Well after all this discussion I think I've come to the conclusion: I think I will just create 2 zpools. One called "duo" or "dual" or something, and one called "single" or some other creative/latin/etc. word for it. The stuff that is easy to replace just by re-ripping it to disk (other than the time and effort to do so) I will keep on that raidz1 one. The new disks I'll make into a raidz2, and keep the more important/harder to find stuff/backups on the raidz2. I just don't know if I want to go with setting up raidz2, moving everything off the existing one (9tb or so) to the new raidz2 + another temporary area and re-do the existing raidz1 into raidz2. I'm not sure it's -that- important. If my chassis supported more disks, I wouldn't be as frugal, but I have limited space and I would like to squeeze more space out of it if I can. Sounds like a reasonable idea, no? Follow up question: can I add a single disk to the existing raidz2 later on (if somehow I found more space in my chassis) so instead of a 7 disk raidz2 (5+2) it becomes a 6+2 ? Thanks... _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
