Hi all, I converted my RAID5 from 8 disks to 6 disks using "mdadm --grow /dev/md0 --array-size" and then "mdadm --grow /dev/md0 --raid-devices=6" and after rebooting, it won't mount. It has been running fine for about a year. File system is XFS. Here is some info on it.... mtehonica@ghostrider:~$ sudo mdadm -D /dev/md0 /dev/md0: Version : 1.01 Creation Time : Mon Dec 21 19:40:58 2009 Raid Level : raid5 Array Size : 7325690880 (6986.32 GiB 7501.51 GB) Used Dev Size : 1465138176 (1397.26 GiB 1500.30 GB) Raid Devices : 6 Total Devices : 8 Persistence : Superblock is persistent Update Time : Wed Feb 16 19:13:50 2011 State : clean Active Devices : 6 Working Devices : 8 Failed Devices : 0 Spare Devices : 2 Layout : left-symmetric Chunk Size : 512K Name : ghostrider:0 (local to host ghostrider) UUID : b4ba7316:08976ceb:3ab7af7b:430ff147 Events : 327264 Number Major Minor RaidDevice State 0 8 80 0 active sync /dev/sdf 1 8 16 1 active sync /dev/sdb 3 8 64 2 active sync /dev/sde 4 8 48 3 active sync /dev/sdd 5 8 0 4 active sync /dev/sda 8 8 112 5 active sync /dev/sdh 6 8 144 - spare /dev/sdj 7 8 128 - spare /dev/sdi mtehonica@ghostrider:~$ sudo mdadm -E /dev/sda /dev/sda: Magic : a92b4efc Version : 1.1 Feature Map : 0x0 Array UUID : b4ba7316:08976ceb:3ab7af7b:430ff147 Name : ghostrider:0 (local to host ghostrider) Creation Time : Mon Dec 21 19:40:58 2009 Raid Level : raid5 Raid Devices : 6 Avail Dev Size : 2930276904 (1397.26 GiB 1500.30 GB) Array Size : 14651381760 (6986.32 GiB 7501.51 GB) Used Dev Size : 2930276352 (1397.26 GiB 1500.30 GB) Data Offset : 264 sectors Super Offset : 0 sectors State : clean Device UUID : 83ff92c5:b7acdfcd:d3ace2b5:0ac3549a Update Time : Wed Feb 16 19:13:52 2011 Checksum : 5053499e - correct Events : 327264 Layout : left-symmetric Chunk Size : 512K Device Role : Active device 4 Array State : AAAAAA ('A' == active, '.' == missing) mtehonica@ghostrider:~$ sudo mount /dev/md0 /test mount: /dev/md0: can't read superblock I tried running xfs_repair and it will just run forever and says "............................found candidate secondary superblock... error reading superblock 80 -- seek to offset 7501512704000 failed unable to verify superblock, continuing... ..........................................................................................................................................". Any insight/help on this would be appreciated! Thanks in advance! Matt -- To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html