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afabco
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Joined: 24 Feb 2004
Posts: 380
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 Posted: Fri Sep 22, 2006 6:04 am Post subject: mdadm, findng out wht mdx a partition is really assigned to? |
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I am (attempting to) setting up a raid0 /tmp file. I'm using the following command:
| Code: | michelle ~ # mdadm -C /dev/md5 -l 0 -n 2 /dev/sda9 /dev/sdb9
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Which gives the following message:
| Code: | mdadm: /dev/sda9 appears to contain an ext2fs file system
size=29302272K mtime=Wed Sep 20 22:14:14 2006
mdadm: /dev/sda9 appears to be part of a raid array:
level=raid0 devices=2 ctime=Wed Sep 20 22:12:20 2006
mdadm: /dev/sdb9 appears to be part of a raid array:
level=raid0 devices=2 ctime=Wed Sep 20 22:12:20 2006
Continue creating array? |
Of course I say 'no'.
First question is what raid array are they part of? It doesn't say. Nor does cat /proc/mdstat have either sda9 or sdb9 listed anywhere.
| Code: | michelle ~ # cat /proc/mdstat
Personalities : [linear] [raid0] [raid1] [raid10] [raid5] [raid4] [raid6]
md1 : active raid1 sdb5[1]
4883648 blocks [2/1] [_U]
md2 : active raid1 sdb6[1]
4883648 blocks [2/1] [_U]
md3 : active raid1 sdb7[1]
4883648 blocks [2/1] [_U]
md4 : active raid1 sdb8[1]
4883648 blocks [2/1] [_U]
md6 : active raid1 sdb10[1]
19534912 blocks [2/1] [_U]
md8 : active raid1 sdb12[1]
19534912 blocks [2/1] [_U]
md13 : active raid5 sde1[2] sdd1[1] sdc1[0]
488391808 blocks level 5, 64k chunk, algorithm 2 [3/3] [UUU]
md0 : active raid1 sdb1[1]
96256 blocks [2/1] [_U]
unused devices: <none> |
And there isn't already an /dev/md5
| Code: | michelle ~ # mdadm --detail --scan
ARRAY /dev/md0 level=raid1 num-devices=2 UUID=8aa590c0:ffcb5e34:fcf0f84a:b3f6154e
ARRAY /dev/md13 level=raid5 num-devices=3 UUID=aeaa46ba:4cc72d05:d58a5dd6:2e2fa766
ARRAY /dev/md8 level=raid1 num-devices=2 UUID=6a065dd8:5b208fd6:1014e603:be9cc068
ARRAY /dev/md6 level=raid1 num-devices=2 UUID=58a141c7:126c06aa:b3088e08:e681fa66
ARRAY /dev/md4 level=raid1 num-devices=2 UUID=830228d0:eaf9e2cd:908a2acc:bae56654
ARRAY /dev/md3 level=raid1 num-devices=2 UUID=330ba20d:37285952:451771b3:277a456e
ARRAY /dev/md2 level=raid1 num-devices=2 UUID=5fc1e1df:6b688fa0:129c147e:418ed8ea
ARRAY /dev/md1 level=raid1 num-devices=2 UUID=da55822d:0bc81dd4:45e3448b:42880da9
michelle ~ # |
| Code: | michelle ~ # mdadm --detail --scan --verbose
ARRAY /dev/md0 level=raid1 num-devices=2 UUID=8aa590c0:ffcb5e34:fcf0f84a:b3f6154e
devices=/dev/sdb1
ARRAY /dev/md13 level=raid5 num-devices=3 UUID=aeaa46ba:4cc72d05:d58a5dd6:2e2fa766
devices=/dev/sdc1,/dev/sdd1,/dev/sde1
ARRAY /dev/md8 level=raid1 num-devices=2 UUID=6a065dd8:5b208fd6:1014e603:be9cc068
devices=/dev/sdb12
ARRAY /dev/md6 level=raid1 num-devices=2 UUID=58a141c7:126c06aa:b3088e08:e681fa66
devices=/dev/sdb10
ARRAY /dev/md4 level=raid1 num-devices=2 UUID=830228d0:eaf9e2cd:908a2acc:bae56654
devices=/dev/sdb8
ARRAY /dev/md3 level=raid1 num-devices=2 UUID=330ba20d:37285952:451771b3:277a456e
devices=/dev/sdb7
ARRAY /dev/md2 level=raid1 num-devices=2 UUID=5fc1e1df:6b688fa0:129c147e:418ed8ea
devices=/dev/sdb6
ARRAY /dev/md1 level=raid1 num-devices=2 UUID=da55822d:0bc81dd4:45e3448b:42880da9
devices=/dev/sdb5 |
So, I'm at a loss. How do I find out where these partitions have been assigned, and then how would I deassign them so that I can set up /dev/md5 ?
Thanks in advance!
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MrUlterior
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Joined: 22 Mar 2005
Posts: 511
Location: Switzerland
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| Posted: Fri Sep 22, 2006 6:07 pm Post subject: |
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It sounds like the partitions were previously used in an array, so when you're trying to create a new array it's detecting the ID of those old arrays.
If you're absolutely certain they're not in-use, either just respond "yes" or dd /dev/zero over the first few Mbytes of the partitionts.
Alternatively, create a new array with each of them, don't create a filesystem then mount them & see what's there ..
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