I am running mandrake 2006 linux.
uname -a reports
Linux dual_933 2.6.12-12mdksmp #1 SMP Fri Sep 9 17:43:23 CEST 2005 i686
Pentium III (Coppermine) unknown GNU/Linux
I created a raid 5 partition using 4 250gb ide drives and 1 200gb ide
drive (I will get a bigger drive real soon now).
I said:
mdadm --create --verbose /dev/md0 --level=5 --raid-devices=5 /dev/hda
/dev/hdb /dev/hdc /dev/hdd /dev/hdf
Then I formatted it:
mkreiserfs /dev/md0
Then I made an entry in /etc/fstab:
/dev/md0 /mnt/data reiserfs notail 1 2
and I mounted it with 'mount -a'
Everything worked fine, and I filled up the disk.
When I rebooted, the reboot hung. I think for some reason it didn't
automatically start the md0 device, and as a result it couldn't mount
the /dev/md0 partition in my /etc/fstab. I went into single-user mode,
and commented out the /dev/md0 line in /etc/fsab, and I was able to
boot. Then I executed the mdadm --create line, uncommented /etc/fstab,
and I was able to access my data.
I was reading some documentation, and it said that you can use mdadm on
either partitions or on a device (as I did). When you have partitions, I
read that you should set the partition type to 0xFD so they get
autodetected during boot. I can't do this, as I don't have partitions.
I am not sure what I should do to fix the problem.
I would guess I can create one big partition per disk and mark each as
0xFD. I checked the superblock status on all of the disks (shown below)
so it is clear that the disk has a superblock and knows it is raid5.
Please advise.
Jeff Deifik
(Only one shown, but they rest are pretty similar)
mdadm --examine /dev/hda
/dev/hda:
Magic : a92b4efc
Version : 00.90.00
UUID : ce5e9366:d83a232c:3da68804:f6814703
Creation Time : Fri Oct 13 13:02:51 2006
Raid Level : raid5
Device Size : 195360896 (186.31 GiB 200.05 GB)
Array Size : 781443584 (745.24 GiB 800.20 GB)
Raid Devices : 5
Total Devices : 5
Preferred Minor : 0
Update Time : Fri Oct 13 13:09:15 2006
State : clean
Active Devices : 4
Working Devices : 5
Failed Devices : 1
Spare Devices : 1
Checksum : 19f15df2 - correct
Events : 0.9
Layout : left-symmetric
Chunk Size : 64K
Number Major Minor RaidDevice State
this 0 3 0 0 active sync /dev/hda
0 0 3 0 0 active sync /dev/hda
1 1 3 64 1 active sync /dev/hdb
2 2 22 0 2 active sync /dev/hdc
3 3 22 64 3 active sync /dev/hdd
4 4 0 0 4 faulty removed
5 5 33 64 4 spare /dev/hdf
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