On Fri, Aug 22, 2008 at 08:41:25PM +0300, Jussi Hirvi wrote: > How about simply > % mdadm --grow /dev/md3 % mdadm --grow /dev/md3 mdadm: no changes to --grow > What do you get with > % mdadm --detail /dev/md3 /dev/md3: Version : 00.90.01 Creation Time : Wed Aug 20 08:44:30 2008 Raid Level : raid5 Array Size : 2930279808 (2794.53 GiB 3000.61 GB) Device Size : 976759936 (931.51 GiB 1000.20 GB) Raid Devices : 4 Total Devices : 5 Preferred Minor : 3 Persistence : Superblock is persistent Update Time : Fri Aug 22 13:56:47 2008 State : clean Active Devices : 4 Working Devices : 5 Failed Devices : 0 Spare Devices : 1 Layout : left-symmetric Chunk Size : 64K UUID : 8263db8a:f99c070f:349a59c2:2129ca73 Events : 0.80605 Number Major Minor RaidDevice State 0 8 1 0 active sync /dev/sda1 1 8 18 1 active sync /dev/sdb2 2 8 35 2 active sync /dev/sdc3 3 8 52 3 active sync /dev/sdd4 4 8 65 - spare /dev/sde1 -- rgds Stephen