On Wed, 14 Jan 2009, Max Waterman wrote:
Hi,
I have a RAID5 array using 6 disks and 2 spares. I took one spare away for a
few months for another purpose (OS X) and am having trouble adding it back in
as a spare.
I can add it manually :
sudo /sbin/mdadm /dev/md2 -a /dev/sdi
but it doesn't want to add itself in after rebooting (the other spare is
added ok).
After reboot, show dmesg/logs, what is the error? I would try:
1. mdadm --examine --scan
2. Put that info into mdadm.conf.
3. Reboot, see if its good.
4. Otherwise, remove the spare from the array, zero the mdadm superblock.
5. Re-add it to the array.
6. Worst case, zero out the drive and then re-add it and re-run step 1 and
add the new information to mdadm.conf.
I'm sure this is simple for someone...
Max.
/dev/md2:
Version : 00.90
Creation Time : Sat Aug 6 05:18:41 2005
Raid Level : raid5
Array Size : 976804480 (931.55 GiB 1000.25 GB)
Used Dev Size : 195360896 (186.31 GiB 200.05 GB)
Raid Devices : 6
Total Devices : 8
Preferred Minor : 2
Persistence : Superblock is persistent
Update Time : Wed Jan 14 11:27:11 2009
State : clean
Active Devices : 6
Working Devices : 8
Failed Devices : 0
Spare Devices : 2
Layout : left-symmetric
Chunk Size : 64K
UUID : 15bfec75:595ac793:0914f8ee:862effd8
Events : 0.9341278
Number Major Minor RaidDevice State
0 8 80 0 active sync /dev/sdf
1 8 96 1 active sync /dev/sdg
2 8 16 2 active sync /dev/sdb
3 8 48 3 active sync /dev/sdd
4 8 32 4 active sync /dev/sdc
5 8 64 5 active sync /dev/sde
6 8 128 - spare /dev/sdi
7 8 112 - spare /dev/sdh
..../etc/mdadm/mdadm.conf
DEVICE /dev/sd[bcdefghi]
# auto-create devices with Debian standard permissions
CREATE owner=root group=disk mode=0660 auto=yes
# automatically tag new arrays as belonging to the local system
HOMEHOST <system>
# instruct the monitoring daemon where to send mail alerts
MAILADDR davidmaxwaterman@xxxxxxxxxxxxxx
# definitions of existing MD arrays
ARRAY /dev/md2 level=raid5 num-devices=6
UUID=15bfec75:595ac793:0914f8ee:862effd8 spares=2
--
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
