Yeah, I've been reading up. I'm probably doing a raidz2 on the thing. My "old" RAID5 should be done rebuilding in about an hour, I'll try some recovery tricks after that. Even if it works, I'm making a raidz2 out of the new drives, moving everything over and then adding the old drives to the new raidz2. On Wed, 6 Nov 2013, Thomas Lunde wrote: > > >> On Nov 6, 2013, at 11:43 AM, tclug at freakzilla.com wrote: >> >> I have 8 disks in there. What I assumed RAID5 would do with that was 6+2, which is fine by me. If ZFS can give me the same result as a RAID5 array can (as in, a continuous 18TB filesystem with 6TB for parity, or whatever) I'm totally fine with that. I will have to read up on ZFS, which I should've done ages ago anyway. > > 18T is no problem for ZFS. It sounds like you have 3T disks in RAID5 + a hot spare. With such large disks, that's a really bad idea because you have very high odds of hitting an error while trying to rebuild your array. Here's one semi-technical explanation : > http://www.zdnet.com/blog/storage/why-raid-5-stops-working-in-2009/162 > > RAID6 or, better, raidz2 would be a good idea -- even better than RAID10 for data security: > http://forums.anandtech.com/showthread.php?t=2151343 > > ZFS' scrubbing, checksums, snapshots, etc. have won me over. > > > Thomas > _______________________________________________ > TCLUG Mailing List - Minneapolis/St. Paul, Minnesota > tclug-list at mn-linux.org > http://mailman.mn-linux.org/mailman/listinfo/tclug-list >