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Old 03-01-2011, 01:14 AM   #1
moodah
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Registered: Sep 2010
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mdadm raid 5 help needed (before I send myself bald)


Hi Guys. Are there any resident mdadm experts that can help me out?

I am getting these ridiculous output after I create a new raid 5 array.

This is the command I used along with the output of the creation..

Quote:
mdadm --create --verbose /dev/md0 --level=5 --raid-devices=6 /dev/sda1 /dev/sdb1 /dev/sdc1 /dev/sdd1 /dev/sde1 /dev/sdf1
mdadm: layout defaults to left-symmetric
mdadm: chunk size defaults to 64K
mdadm: /dev/sda1 appears to contain an ext2fs file system
size=1953512000K mtime=Thu Jan 1 10:00:00 1970
mdadm: /dev/sda1 appears to be part of a raid array:
level=raid5 devices=6 ctime=Tue Mar 1 16:33:54 2011
mdadm: /dev/sdb1 appears to contain an ext2fs file system
size=1953512000K mtime=Thu Jan 1 10:00:00 1970
mdadm: /dev/sdb1 appears to be part of a raid array:
level=raid5 devices=6 ctime=Mon Feb 28 20:48:21 2011
mdadm: /dev/sdc1 appears to contain an ext2fs file system
size=1953512000K mtime=Thu Jan 1 10:00:00 1970
mdadm: /dev/sdc1 appears to be part of a raid array:
level=raid5 devices=6 ctime=Mon Feb 28 20:48:21 2011
mdadm: /dev/sdd1 appears to contain an ext2fs file system
size=1953512000K mtime=Thu Jan 1 10:00:00 1970
mdadm: /dev/sdd1 appears to be part of a raid array:
level=raid5 devices=6 ctime=Mon Feb 28 20:48:21 2011
mdadm: /dev/sde1 appears to contain an ext2fs file system
size=1953512000K mtime=Thu Jan 1 10:00:00 1970
mdadm: /dev/sde1 appears to be part of a raid array:
level=raid5 devices=6 ctime=Mon Feb 28 20:48:21 2011
mdadm: /dev/sdf1 appears to contain an ext2fs file system
size=1953512000K mtime=Thu Jan 1 10:00:00 1970
mdadm: /dev/sdf1 appears to be part of a raid array:
level=raid5 devices=6 ctime=Mon Feb 28 07:52:30 2011
mdadm: size set to 1953511936K
Continue creating array? y
mdadm: array /dev/md0 started.
All good so far... but now look what happens..

Quote:
mdadm --detail --scan /dev/md0
/dev/md0:
Version : 00.90
Creation Time : Tue Mar 1 17:26:44 2011
Raid Level : raid5
Array Size : 9767559680 (9315.07 GiB 10001.98 GB)
Used Dev Size : 1953511936 (1863.01 GiB 2000.40 GB)
Raid Devices : 6
Total Devices : 6
Preferred Minor : 0
Persistence : Superblock is persistent

Update Time : Tue Mar 1 17:29:01 2011
State : clean, degraded
Active Devices : 5
Working Devices : 5
Failed Devices : 1
Spare Devices : 0

Layout : left-symmetric
Chunk Size : 64K

UUID : 3dfd8336:af24ffde:13fd50f2:7be02c9e
Events : 0.6

Number Major Minor RaidDevice State
0 8 1 0 active sync /dev/sda1
1 8 17 1 active sync /dev/sdb1
2 8 33 2 active sync /dev/sdc1
3 8 49 3 active sync /dev/sdd1
4 8 65 4 active sync /dev/sde1
5 0 0 5 removed

6 8 81 - faulty spare /dev/sdf1
root@mediacentre2:~# mdadm --detail --scan
ARRAY /dev/md0 level=raid5 num-devices=6 metadata=00.90 UUID=3dfd8336:af24ffde:13fd50f2:7be02c9e
What the hell! I've been trying to build this damn thing for 20 hours now and I keep getting all these weird kinds of errors. I figure its about time that looked for some professional help.
 
Old 03-01-2011, 09:20 PM   #2
moodah
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Registered: Sep 2010
Posts: 15

Original Poster
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=( Is there noone out there that can help me?
 
Old 03-02-2011, 08:04 PM   #3
chrism01
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Registered: Aug 2004
Location: Sydney
Distribution: Rocky 9.2
Posts: 18,348

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The main thing I see is that sdf1 is 'faulty'. Possibly you just need to

1. remove from array using mdadm --fail & --remove : see Manage mode notes http://linux.die.net/man/8/mdadm
2. go into fdisk, (re-)create a partition on that disk and set type as 'fd'.
3. mdadm --add ....

You also try a fsck on it after the partition, but before 'add'ing it. NB disk should be umounted for a fsck.
Possibly it really is a dead Disk... (loose cable?)
 
  


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