Hello,
I've been messing around with problem for over a week now and did not
find any solution, so this is why I hope to find help in this way...
I have a fresh debian sarge installation (kernel 2.6.8-2-386) on a
RAID 1 array (this array was created during the installation process
using the debian setup routine).
The RAID1 array /dev/md0 consists of 2 different hard disks and works
fine.
Now I have 4 separate hard disks (400 GB each) and I want to to use
them in a RAID 5 array.
So I did create a blank "Linux raid autodetect" partition on each of
the 4 hard disks using fdisk, this is what "fdisk -l" gives me:
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fdisk -l /dev/sda
Disk /dev/sda: 400.0 GB, 400088457216 bytes
255 heads, 63 sectors/track, 48641 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Device Boot Start End Blocks Id System
/dev/sda1 1 48641 390708801 fd Linux raid
autodetect
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(same for /dev/sdb, /dev/sdc and /dev/sdd)
Then I did:
mdadm --create --force /dev/md1 --level=raid5 --chunk=64 --
parity=left-symmetric --raid-devices=4 /dev/sda1 /dev/sdb1 /dev/sdc1 /
dev/sdd1
After the sync had finished, I wrote the new mdadm config file:
mdadm --detail --scan > /etc/mdadm/mdadm.conf
I added a DEVICE line, becaus I read this would help the arrays to be
recognized. This is how the mdadm.conf looks like:
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DEVICE /dev/sda1 /dev/sdb1 /dev/sdc1 /dev/sdd1 /dev/hda1 /dev/hdb1
ARRAY /dev/md1 level=raid5 num-devices=4
UUID=a2e5426c:b2830333:accac389:9393124d
devices=/dev/sda1,/dev/sdb1,/dev/sdc1,/dev/sdd1
ARRAY /dev/md0 level=raid1 num-devices=2 UUID=b5e33bba:
3509dbed:aed82fc4:46628aec
devices=/dev/hda1,/dev/hdb1
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Then I created the file system:
mkfs.ext3 -b 4096 -R stride=16 /dev/md1
I edited the /etc/fstab, it looks like this:
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# /etc/fstab: static file system information.
#
# <file system> <mount point> <type> <options> <dump> <pass>
proc /proc proc defaults 0 0
/dev/md0 / ext3 defaults,errors=remount-ro
0 1
/dev/md1 /pacs ext3 defaults 0 2
/dev/hda3 /tmp ext3 defaults 0 2
/dev/hdb3 /tmp2 ext3 defaults 0 2
/dev/hda2 none swap sw 0 0
/dev/hdb2 none swap sw 0 0
/dev/hdc /media/cdrom0 iso9660 ro,user,noauto 0 0
/dev/fd0 /media/floppy0 auto rw,user,noauto 0 0
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(the /pacs mount point exists)
When rebooting, the fsck fails, giving me the following warning:
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fsck.ext3: Invalid argument while trying to open /dev/md1
/dev/md1:
The superblock could not be read or does not describe a correct ext2
filesystem. If the device is valid and it really contains an ext2
filesystem (and not swap or ufs or something else), then the
superblock is corrupt, and you might try running e2fsck with an
alternate superblock:
e2fsck -b 8193 <device>
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I continue the boot process, then the /proc/mdstat looks like this:
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Personalities : [raid1]
md0 : active raid1 hda1[0] hdb1[1]
39061952 blocks [2/2] [UU]
unused devices: <none>
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Then I do "mdadm -A -s", it gives:
mdadm: /dev/md1 has been started with 4 drives.
and the /proc/mdstat:
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Personalities : [raid1] [raid5]
md1 : active raid5 sda1[0] sdd1[3] sdc1[2] sdb1[1]
1172126208 blocks level 5, 64k chunk, algorithm 2 [4/4] [UUUU]
md0 : active raid1 hda1[0] hdb1[1]
39061952 blocks [2/2] [UU]
unused devices: <none>
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This is what I get with "mdadm --examine /dev/sda1":
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/dev/sda1:
Magic : a92b4efc
Version : 00.90.00
UUID : a2e5426c:b2830333:accac389:9393124d
Creation Time : Tue May 9 09:33:20 2006
Raid Level : raid5
Raid Devices : 4
Total Devices : 4
Preferred Minor : 1
Update Time : Tue May 9 18:52:03 2006
State : clean
Active Devices : 4
Working Devices : 4
Failed Devices : 0
Spare Devices : 0
Checksum : defd3829 - correct
Events : 0.12
Layout : left-symmetric
Chunk Size : 64K
Number Major Minor RaidDevice State
this 0 8 1 0 active sync /dev/sda1
0 0 8 1 0 active sync /dev/sda1
1 1 8 17 1 active sync /dev/sdb1
2 2 8 33 2 active sync /dev/sdc1
3 3 8 49 3 active sync /dev/sdd1
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I can mount the array without problems, but I cannot read/write on it:
mount -t ext3 /dev/md1 /pacs
Can you please help me with that?
Thank you _very_ much in advance!
Best regards,
Stephan
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