Hi Everyone,
Nothing worked with the last mail, so I tried it again. A different
approach.
What I tried again:
1. I stopped and deleted the array using:
mdadm --stop /dev/md126
mdadm --stop /dev/md127
mdadm --remove /dev/md127
mdadm --zero-superblock /dev/sdb
mdadm --zero-superblock /dev/sdc
mdadm --zero-superblock /dev/sdd
mdadm --zero-superblock /dev/sde
2. I deleted all data (including partition table) on every HDD:
dd if=/dev/zero of=/dev/sd[b-e] bs=512 count=1
3. Checked if mdadm --assemble --scan can find any arrays, but I did not
find anything.
4. I created the array again using
https://raid.wiki.kernel.org/index.php/RAID_setup#External_Metadata
mdadm --create --verbose /dev/md/imsm /dev/sd[b-e] --raid-devices 4
--metadata=imsm
mdadm --create --verbose /dev/md/raid /dev/md/imsm --raid-devices 4
--level 5
The new Array did not have any partitions, since I deleted everything.
So everything looks good.
The details are:
# mdadm -D /dev/md127
/dev/md127:
Version : imsm
Raid Level : container
Total Devices : 4
Working Devices : 4
UUID : 790217ac:df4a8367:7892aaab:b822d6eb
Member Arrays :
Number Major Minor RaidDevice
0 8 16 - /dev/sdb
1 8 32 - /dev/sdc
2 8 48 - /dev/sdd
3 8 64 - /dev/sde
# mdadm -D /dev/md126
/dev/md126:
Container : /dev/md/imsm, member 0
Raid Level : raid5
Array Size : 2930280448 (2794.53 GiB 3000.61 GB)
Used Dev Size : 976760320 (931.51 GiB 1000.20 GB)
Raid Devices : 4
Total Devices : 4
State : clean
Active Devices : 4
Working Devices : 4
Failed Devices : 0
Spare Devices : 0
Layout : left-asymmetric
Chunk Size : 128K
UUID : 4ebb43fd:6327cb4e:2506b1d3:572e774e
Number Major Minor RaidDevice State
0 8 48 0 active sync /dev/sdd
1 8 32 1 active sync /dev/sdc
2 8 16 2 active sync /dev/sdb
3 8 64 3 active sync /dev/sde
# cat /proc/mdstat
Personalities : [linear] [multipath] [raid0] [raid1] [raid6] [raid5]
[raid4] [raid10]
md126 : active (read-only) raid5 sde[3] sdb[2] sdc[1] sdd[0]
2930280448 blocks super external:/md127/0 level 5, 128k chunk,
algorithm 0 [4/4] [UUUU]
resync=PENDING
md127 : inactive sde[3](S) sdd[2](S) sdc[1](S) sdb[0](S)
836 blocks super external:imsm
unused devices: <none>
Then I stored the configuration of the array using the command
mdadm --examine --scan >> /etc/mdadm.conf
5. I used dpkg-reconfigure mdadm to make sure mdadm starts properly at
boot time.
6. I rebooted and checked if the array was created in BIOS of the Intel
raid.
Yes it is existing, and it looks good there.
7. I still cannot see the created array. But in palimpsest I see that my
four hard drives are a part of a raid.
I also checked the logs for any strange entries, but no success :S
9. I used mdadm --assemble --scan to see the array in palimpsest
10. Started sync process using command from
http://linuxmonk.ch/trac/wiki/LinuxMonk/Sysadmin/SoftwareRAID#CheckRAIDstate
#echo active > /sys/block/md126/md/array_state
#cat /proc/mdstat
Personalities : [linear] [multipath] [raid0] [raid1] [raid6] [raid5]
[raid4] [raid10]
md126 : active raid5 sdd[3] sdc[2] sdb[1] sde[0]
2930280448 blocks super external:/md127/0 level 5, 128k chunk,
algorithm 0 [4/4] [UUUU]
[>....................] resync = 0.9% (9029760/976760320)
finish=151.7min speed=106260K/sec
The problem is that the raid was gone after a restart. So I did step 9
and 10 again.
11. Then I started to create a gtp partition table with parted.
Unfortunately mktable gpt on device /dev/md/raid (or the target of the
link /dev/md126) never came back. Even after a few hours.
I really do not know what else I need to do to get the raid working. Can
someone help me? I do not think I am the first person having trouble
with it :S
Kind Regards,
Iwan
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