I am trying to replace the two small drives in my raid1 mirror with two
larger drives. I failed and removed the first drive and am now trying to
add a new larger drive to take its place. The add command completes
without any obvious error but the new dive is not added to the array.
What am I missing?
A superblock is written on the new array partition but its role is
'spare' and it does not show up in /proc/mdstat.
Kernel 3.2.7-1.fc16.x86_64
mdadm - v3.2.3 - 23rd December 2011
It appears that mdadm does detect an error but doesn't say anything
about it:
# mdadm --manage /dev/md0 --add /dev/sdz2 ; echo $?
1
I do see the following in the logs:
[ 2913.075120] scsi_verify_blk_ioctl: 74 callbacks suppressed
[ 2913.080708] mdadm: sending ioctl 1261 to a partition!
...
[ 2913.137556] mdadm: sending ioctl 1261 to a partition!
# mdadm -D /dev/md0
/dev/md0:
Version : 1.2
Creation Time : Tue Jan 10 20:28:20 2006
Raid Level : raid1
Array Size : 15634360 (14.91 GiB 16.01 GB)
Used Dev Size : 15634360 (14.91 GiB 16.01 GB)
Raid Devices : 2
Total Devices : 1
Persistence : Superblock is persistent
Intent Bitmap : Internal
Update Time : Sat Mar 3 12:43:41 2012
State : active, degraded
Active Devices : 1
Working Devices : 1
Failed Devices : 0
Spare Devices : 0
Name : ***.*****.***:0 (local to host ***.*****.***)
UUID : b5d9fcd0:5baaaff8:492c3e4b:22636aac
Events : 499
Number Major Minor RaidDevice State
0 0 0 0 removed
1 8 130 1 active sync /dev/sdi2
# mdadm -E /dev/sdz2
/dev/sdz2:
Magic : a92b4efc
Version : 1.2
Feature Map : 0x1
Array UUID : b5d9fcd0:5baaaff8:492c3e4b:22636aac
Name : ***.*****.***:0 (local to host ***.*****.***)
Creation Time : Tue Jan 10 20:28:20 2006
Raid Level : raid1
Raid Devices : 2
Avail Dev Size : 83884032 (40.00 GiB 42.95 GB)
Array Size : 31268720 (14.91 GiB 16.01 GB)
Used Dev Size : 31268720 (14.91 GiB 16.01 GB)
Data Offset : 2048 sectors
Super Offset : 8 sectors
State : clean
Device UUID : 50670e17:d3e5fe82:e572e701:7460bcc4
Internal Bitmap : 8 sectors from superblock
Update Time : Sat Mar 3 12:41:18 2012
Checksum : 4bb687db - correct
Events : 0
Device Role : spare
Array State : .A ('A' == active, '.' == missing)
]# cat /proc/mdstat
Personalities : [raid1] [raid6] [raid5] [raid4]
md2 : active raid5 sdv2[9] sdo2[1] sdx2[4] sdl2[5] sdw2[10] sdp2[2]
sdk2[6] sdm2[8] sdq2[3] sdn2[7] sdr2[0]
6641912320 blocks level 5, 128k chunk, algorithm 2 [11/11]
[UUUUUUUUUUU]
md1 : active raid5 sdx1[6] sdb1[9] sdp1[7] sdl1[11] sdr1[4] sdg1[3]
sdk1[10] sdq1[8] sdh1[0] sdv1[13] sdm1[14] sdw1[12] sdn1[2] sdf1[1] sdo1[5]
4375960064 blocks level 5, 64k chunk, algorithm 2 [15/15]
[UUUUUUUUUUUUUUU]
md0 : active raid1 sdi2[1]
15634360 blocks super 1.2 [2/1] [_U]
bitmap: 1/1 pages [4KB], 65536KB chunk
unused devices: <none>
--Larkin
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