Problem 1: "Used Dev Size"
====================
Note: the system is a Gentoo box, so perhaps I have missed a kernel
configuration option or use flag to deal with large hard drives.
A week or two ago, I resized a raid1 array using 2x3TB drives. I went
through the usual routine: failed one drive, installed and partitioned
(with gdisk) the new 3TB drive, added it to the array, waited for it
to sync, then did the same for the other drive. Finally, I grew the
array to max size and resized the filesystem to its maximum size.
However, after a reboot, I got many errors such as:
EXT3-fs error (device md5): ext3_get_inode_loc: unable to read inode
block - inode=150568961, block=301137922
I tracked this down to the array being the wrong size (too small), so
I unmounted the filesystem grew the array (again) to its max size and
remounted. It seems to be working now, however, it is still syncing:
md5 : active raid1 sdd2[0] sdc2[1]
2773437376 blocks [2/2] [UU]
[=======>.............] resync = 38.2% (1060384320/2773437376)
finish=357.9min speed=79766K/sec
Investigating further, both sdc2 and sdd2 show a negative "Used Dev Size":
mdadm --examine /dev/sdc2
/dev/sdc2:
Magic : a92b4efc
Version : 0.90.00
UUID : 5e21499a:f5562ae2:3b3bf1a1:6e290ac2
Creation Time : Tue May 15 16:33:14 2007
Raid Level : raid1
Used Dev Size : -1521529920 (2644.96 GiB 2840.00 GB) <<<<<<< WTF???
Array Size : 2773437376 (2644.96 GiB 2840.00 GB)
Raid Devices : 2
Total Devices : 2
Preferred Minor : 5
Update Time : Tue Jun 28 21:01:14 2011
State : active
Active Devices : 2
Working Devices : 2
Failed Devices : 0
Spare Devices : 0
Checksum : dfcdddaf - correct
Events : 2222657
Number Major Minor RaidDevice State
this 1 8 34 1 active sync /dev/sdc2
0 0 8 50 0 active sync /dev/sdd2
1 1 8 34 1 active sync /dev/sdc2
--detail shows a negative dev size also:
mdadm --detail /dev/md5
/dev/md5:
Version : 0.90
Creation Time : Tue May 15 16:33:14 2007
Raid Level : raid1
Array Size : 2773437376 (2644.96 GiB 2840.00 GB)
Used Dev Size : -1
<<<<<< WTF?
Raid Devices : 2
Total Devices : 2
Preferred Minor : 5
Persistence : Superblock is persistent
Update Time : Tue Jun 28 21:01:14 2011
State : active, resyncing
Active Devices : 2
Working Devices : 2
Failed Devices : 0
Spare Devices : 0
Rebuild Status : 38% complete
UUID : 5e21499a:f5562ae2:3b3bf1a1:6e290ac2
Events : 0.2222657
Number Major Minor RaidDevice State
0 8 50 0 active sync /dev/sdd2
1 8 34 1 active sync /dev/sdc2
Since, I obviously don't want the array to shrink again and this looks
dangerous, I would appreciate advice on how to handle this problem.
Problem 2: Can't start array
====================
Whatever I do, I can't start md4:
mdadm /dev/md4 --assemble
mdadm: /dev/md4 is already in use.
/proc/mdadm:
md4 : inactive sdc1[0](S)
58591232 blocks super 1.2
mdadm --detail /dev/md4
mdadm: md device /dev/md4 does not appear to be active.
# mdadm --examine /dev/sdc1
/dev/sdc1:
Magic : a92b4efc
Version : 1.2
Feature Map : 0x0
Array UUID : 6b67311b:9732e436:07da8ce8:61e8af9c
Name : server2:4 (local to host server2)
Creation Time : Fri Jun 10 20:41:23 2011
Raid Level : raid1
Raid Devices : 2
Avail Dev Size : 117182464 (55.88 GiB 60.00 GB)
Array Size : 117182320 (55.88 GiB 60.00 GB)
Used Dev Size : 117182320 (55.88 GiB 60.00 GB)
Data Offset : 2048 sectors
Super Offset : 8 sectors
State : clean
Device UUID : f8d1f97e:b15f2e09:a7d55392:b193991a
Update Time : Tue Jun 28 19:20:08 2011
Checksum : f6fb6a5 - correct
Events : 53
Device Role : Active device 0
Array State : AA ('A' == active, '.' == missing)
# mdadm --examine /dev/sdd1
/dev/sdd1:
Magic : a92b4efc
Version : 1.2
Feature Map : 0x0
Array UUID : 6b67311b:9732e436:07da8ce8:61e8af9c
Name : server2:4 (local to host server2)
Creation Time : Fri Jun 10 20:41:23 2011
Raid Level : raid1
Raid Devices : 2
Avail Dev Size : 117182464 (55.88 GiB 60.00 GB)
Array Size : 117182320 (55.88 GiB 60.00 GB)
Used Dev Size : 117182320 (55.88 GiB 60.00 GB)
Data Offset : 2048 sectors
Super Offset : 8 sectors
State : clean
Device UUID : 44d1af39:96641daa:ee077d7b:d244ef54
Update Time : Tue Jun 28 19:20:08 2011
Checksum : 8e939e3f - correct
Events : 53
Device Role : Active device 1
Array State : AA ('A' == active, '.' == missing)
Thanks!
Simon
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