Hi All, Just an update for anyone following this; it's now working as expected on mdadm v3.1.2 & kernel 2.6.34-rc3. /dev/md0: Version : 0.91 Creation Time : Fri Apr 4 21:17:09 2008 Raid Level : raid6 Array Size : 9767624960 (9315.13 GiB 10002.05 GB) Used Dev Size : 976762496 (931.51 GiB 1000.20 GB) Raid Devices : 12 Total Devices : 13 Preferred Minor : 0 Persistence : Superblock is persistent Update Time : Sun Apr 4 17:14:25 2010 State : clean, recovering Active Devices : 13 Working Devices : 13 Failed Devices : 0 Spare Devices : 0 Layout : left-symmetric Chunk Size : 64K Reshape Status : 14% complete Delta Devices : -1, (12->11) UUID : 251f6c00:b15f5541:4eb0bc47:eeccb517 Events : 0.6084463 Number Major Minor RaidDevice State 0 259 557056 0 active sync /dev/sdq 1 259 294912 1 active sync /dev/sdr 2 259 819200 2 active sync /dev/sds 3 259 786432 3 active sync /dev/sdd 4 259 688128 4 active sync /dev/sdu 5 259 425984 5 active sync /dev/sdv 6 259 851968 6 active sync /dev/sdl 7 259 196608 7 active sync /dev/sdm 8 259 720896 8 active sync /dev/sdn 9 259 458752 9 active sync /dev/sdo 10 259 0 10 active sync /dev/sda 11 259 524288 11 active sync /dev/sdb 12 259 262144 12 active sync /dev/sdc md0 : active raid6 sdq[0] sdc[12] sdb[11] sda[10] sdo[9] sdn[8] sdm[7] sdl[6] sdv[5] sdu[4] sdd[3] sds[2] sdr[1] 9767624960 blocks super 0.91 level 6, 64k chunk, algorithm 2 [12/12] [UUUUUUUUUUUU] [==>..................] reshape = 14.7% (143969472/976762496) finish=1871.0min speed=7417K/sec Cheers, Brett. -- 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