On Thu, 29 Mar 2007, Rainer Fuegenstein wrote:
hi,
I manually created my first raid5 on 4 400 GB pata harddisks:
[root@server ~]# mdadm --create --verbose /dev/md0 --level=5 --raid-devices=4 --spare-devices=0 /dev/hde1 /dev/hdf1 /dev/hdg1 /dev/hdh1
mdadm: layout defaults to left-symmetric
mdadm: chunk size defaults to 64K
mdadm: size set to 390708736K
mdadm: array /dev/md0 started.
but, mdstat shows:
[root@server ~]# cat /proc/mdstat
Personalities : [raid6] [raid5] [raid4]
md0 : active raid5 hdh1[4] hdg1[2] hdf1[1] hde1[0]
1172126208 blocks level 5, 64k chunk, algorithm 2 [4/3] [UUU_]
unused devices: <none>
I'm surprised to see that there's one "failed" device [UUU_] ?
shouldn't it read [UUUU] ?
root@alfred ~]# mdadm --detail --scan mdadm --misc --detail /dev/md0
mdadm: cannot open mdadm: No such file or directory
/dev/md0:
Version : 00.90.03
Creation Time : Thu Mar 29 19:21:29 2007
Raid Level : raid5
Array Size : 1172126208 (1117.83 GiB 1200.26 GB)
Device Size : 390708736 (372.61 GiB 400.09 GB)
Raid Devices : 4
Total Devices : 4
Preferred Minor : 0
Persistence : Superblock is persistent
Update Time : Thu Mar 29 19:37:07 2007
State : clean
Active Devices : 4
Working Devices : 4
Failed Devices : 0
Spare Devices : 0
Layout : left-symmetric
Chunk Size : 64K
UUID : 08c98d1b:d0b5614d:d6893163:61d4bf1b
Events : 0.596
Number Major Minor RaidDevice State
0 33 1 0 active sync /dev/hde1
1 33 65 1 active sync /dev/hdf1
2 34 1 2 active sync /dev/hdg1
2 0 0 0 removed
4 34 65 4 active sync /dev/hdh1
... and why is there a "removed" entry ?
sorry if these questions are stupid, but this is my first raid5 and
I'm a bit worried.
cu
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Strange, it should read [UUUU].. Correct, I would mdadm --zero-superblock
on all those drives and re-create the array (mdadm -S (stop it first)) of
course before you do it.
Justin.
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