I have recently created a RAID 5 array under Ubuntu 11.04 and am having some trouble getting it to assemble correctly on system boot. So far after every boot the array assembles correctly but in read-only mode at /dev/md127. Stopping this array and running:
Code:
mdadm --assemble --scan
will correctly mount the array at /dev/md0. My mdadm.conf file:
Code:
DEVICE partitions
ARRAY /dev/md/0 metadata=1.2 name=nagelnas:0 UUID=e4665ceb:15f8e4b6:b186d497:7d365254
detail of the array:
Code:
sudo mdadm --detail /dev/md0
/dev/md0:
Version : 1.2
Creation Time : Sun May 15 22:39:38 2011
Raid Level : raid5
Array Size : 5860544512 (5589.05 GiB 6001.20 GB)
Used Dev Size : 1465136128 (1397.26 GiB 1500.30 GB)
Raid Devices : 5
Total Devices : 5
Persistence : Superblock is persistent
Update Time : Sun May 22 09:52:09 2011
State : clean
Active Devices : 5
Working Devices : 5
Failed Devices : 0
Spare Devices : 0
Layout : left-symmetric
Chunk Size : 512K
Name : nagelnas:0 (local to host nagelnas)
UUID : e4665ceb:15f8e4b6:b186d497:7d365254
Events : 18
Number Major Minor RaidDevice State
0 8 0 0 active sync /dev/sda
1 8 16 1 active sync /dev/sdb
2 8 32 2 active sync /dev/sdc
3 8 48 3 active sync /dev/sdd
5 8 64 4 active sync /dev/sde
cat /proc/mdstat
Personalities : [linear] [multipath] [raid0] [raid1] [raid6] [raid5] [raid4] [raid10]
md0 : active raid5 sda[0] sde[5] sdd[3] sdc[2] sdb[1]
5860544512 blocks super 1.2 level 5, 512k chunk, algorithm 2 [5/5] [UUUUU]
unused devices: <none>
examine of one of the disks in the array:
Code:
sudo mdadm --examine /dev/sda
/dev/sda:
Magic : a92b4efc
Version : 1.2
Feature Map : 0x0
Array UUID : e4665ceb:15f8e4b6:b186d497:7d365254
Name : nagelnas:0 (local to host nagelnas)
Creation Time : Sun May 15 22:39:38 2011
Raid Level : raid5
Raid Devices : 5
Avail Dev Size : 2930273007 (1397.26 GiB 1500.30 GB)
Array Size : 11721089024 (5589.05 GiB 6001.20 GB)
Used Dev Size : 2930272256 (1397.26 GiB 1500.30 GB)
Data Offset : 2048 sectors
Super Offset : 8 sectors
State : clean
Device UUID : 922f3fc5:b9078b42:86230bc3:b8abfc7e
Update Time : Sun May 22 09:51:29 2011
Checksum : 5274f4ec - correct
Events : 18
Layout : left-symmetric
Chunk Size : 512K
Device Role : Active device 0
Array State : AAAAA ('A' == active, '.' == missing)
Any idea what I am doing wrong here? Not the biggest deal in the world to assemble the array by hand but still something I want to have happen automatically.
Thanks,
Andrew
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