> -Peter Tribble wrote: >> On Sun, Jul 6, 2008 at 8:48 AM, Rob Clark wrote: >> I have eight 10GB drives. >> ... >> I have 6 remaining 10 GB drives and I desire to >> "raid" 3 of them and "mirror" them to the other 3 to >> give me raid security and integrity with mirrored >> drive performance. I then want to move my "/export" >> directory to the new drive. >> ...
> You can't do that. You can't layer raidz and mirroring. > You'll either have to use raidz for the lot, or just use mirroring: > zpool create temparray mirror c1t2d0 c1t4d0 mirror c1t5d0 c1t3d0 mirror > c1t6d0 c1t8d0 > -Peter Tribble Solaris may not allow me to do that but the concept is not unheard of: Quoting: Proceedings of the Third USENIX Conference on File and Storage Technologies http://www.usenix.org/publications/library/proceedings/fast04/tech/corbett/corbett.pdf "Mirrored RAID-4 and RAID-5 protect against higher order failures [4]. However, the efficiency of the array as measured by its data capacity divided by its total disk space is reduced." [4] Qin Xin, E. Miller, T. Schwarz, D. Long, S. Brandt, W. Litwin, ”Reliability mechanisms for very large storage systems”, 20th IEEE/11th NASA Boddard Conference on Mass Storage Systems and Technologies, San Diego, CA, pgs. 146-156, Apr. 2003. Rob This message posted from opensolaris.org _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
