All,
I'm fairly new to Linux/Debian and have been trying to configure mdadm
for RAID1 with 2x120Gb IDE disks. Unfortunately, I have two problems
with the configuration and would really appreciate some advice.
* Problem 1: Since moving from 2.4 -> 2.6 kernel, a reboot kicks one
device out of the array (c.f. post by Andreas Pelzner on 24th Aug 2006).
* Problem 2: When booting my system, unless both disks plugged in, I get
a kernel panic (oh dear!):
> mdadm md0 stopped
> mdadm cannot open device /dev/hda6 no such device or address
> mdadm /dev/hda6 has wrong uuid
> mdadm no devices found for /dev/md0
> ext3fs unable to read superblock
> ecit 2 - unable to read superblock cramfs
> kernel panic attempting to kill init
Here is the information about my system/config:
* System Info:
# uname -a
Linux cinzano. 2.6.8-3-386 #1 Sat Jul 15 09:26:40 UTC 2006 i686 GNU/Linux
* mdadm Config:
# cat /etc/mdadm/mdadm.conf
DEVICE partitions
ARRAY /dev/md1 level=raid1 num-devices=2
UUID=cc518d12:0e602331:8715a849:6dac0873
devices=/dev/hda7,/dev/hdc7
ARRAY /dev/md0 level=raid1 num-devices=2
UUID=07c5cab1:1b86a5ca:f4599353:4ccfc5c1
devices=/dev/hda6,/dev/hdc6
* After reboot:
# cat /proc/mdstat
Personalities : [raid1]
md1 : active raid1 hda7[0]
4675264 blocks [2/1] [U_]
md0 : active raid1 hda6[0]
101562816 blocks [2/1] [U_]
* After hotadding again:
# cat /proc/mdstat
Personalities : [raid1]
md1 : active raid1 hda7[0] hdc7[1]
14675264 blocks [2/2] [UU]
md0 : active raid1 hdc6[1] hda6[0]
101562816 blocks [2/2] [UU]
* Mdadm version
# apt-show-versions | grep mdadm
mdadm/stable uptodate 1.9.0-4sarge1
* System md logs don't mention hdc6
# grep md /var/log/messages
Aug 26 14:21:32 cinzano kernel: Kernel command line: root=/dev/md0 ro
Aug 26 14:21:32 cinzano kernel: md: md driver 0.90.0 MAX_MD_DEVS=256,
MD_SB_DISKS=27
Aug 26 14:21:32 cinzano kernel: md: raid1 personality registered as nr 3
Aug 26 14:21:32 cinzano kernel: md: md0 stopped.
Aug 26 14:21:32 cinzano kernel: md: bind<hda6>
Aug 26 14:21:32 cinzano kernel: raid1: raid set md0 active with 1 out of
2 mirrors
Aug 26 14:21:32 cinzano kernel: EXT3 FS on md0, internal journal
Aug 26 14:21:32 cinzano kernel: md: md1 stopped.
Aug 26 14:21:32 cinzano kernel: md: bind<hdc7>
Aug 26 14:21:32 cinzano kernel: md: bind<hda7>
Aug 26 14:21:32 cinzano kernel: raid1: raid set md1 active with 2 out of
2 mirrors
Aug 26 14:21:32 cinzano kernel: EXT3 FS on md1, internal journal
Aug 26 14:25:43 cinzano kernel: Kernel command line: root=/dev/md0 ro
Aug 26 14:25:43 cinzano kernel: md: md driver 0.90.0 MAX_MD_DEVS=256,
MD_SB_DISKS=27
Aug 26 14:25:43 cinzano kernel: md: raid1 personality registered as nr 3
Aug 26 14:25:43 cinzano kernel: md: md0 stopped.
Aug 26 14:25:43 cinzano kernel: md: bind<hda6>
Aug 26 14:25:43 cinzano kernel: raid1: raid set md0 active with 1 out of
2 mirrors
Aug 26 14:25:43 cinzano kernel: EXT3-fs: md0: orphan cleanup on readonly fs
Aug 26 14:25:43 cinzano kernel: EXT3-fs: md0: 3 orphan inodes deleted
Aug 26 14:25:43 cinzano kernel: EXT3 FS on md0, internal journal
Aug 26 14:25:43 cinzano kernel: md: md1 stopped.
Aug 26 14:25:43 cinzano kernel: md: bind<hdc7>
Aug 26 14:25:43 cinzano kernel: md: bind<hda7>
Aug 26 14:25:43 cinzano kernel: raid1: raid set md1 active with 2 out of
2 mirrors
Aug 26 14:25:43 cinzano kernel: EXT3 FS on md1, internal journal
* FDisk output
# fdisk -l
Disk /dev/hda: 120.0 GB, 120034123776 bytes
255 heads, 63 sectors/track, 14593 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Device Boot Start End Blocks Id System
/dev/hda1 1 14593 117218241 5 Extended
/dev/hda5 1 122 979902 82 Linux swap/Sola.
/dev/hda6 123 12766 101562898+ fd Linux raid auto.
/dev/hda7 12767 14593 14675346 fd Linux raid auto.
Disk /dev/hdc: 120.0 GB, 120034123776 bytes
255 heads, 63 sectors/track, 14593 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Device Boot Start End Blocks Id System
/dev/hdc1 1 14593 117218241 5 Extended
/dev/hdc5 1 122 979902 82 Linux swap/Sola.
/dev/hdc6 123 12766 101562898+ fd Linux raid auto.
/dev/hdc7 12767 14593 14675346 fd Linux raid auto.
Disk /dev/md0: 104.0 GB, 104000323584 bytes
2 heads, 4 sectors/track, 25390704 cylinders
Units = cylinders of 8 * 512 = 4096 bytes
Disk /dev/md0 doesn't contain a valid partition table
Disk /dev/md1: 15.0 GB, 15027470336 bytes
2 heads, 4 sectors/track, 3668816 cylinders
Units = cylinders of 8 * 512 = 4096 bytes
Disk /dev/md1 doesn't contain a valid partition table
* Grub config
# cat /boot/grub/menu.lst
[...]
# groot=(hd0,5)
[...]
title Debian GNU/Linux, kernel 2.6.8-3-386
root (hd0,5)
kernel /boot/vmlinuz-2.6.8-3-386 root=/dev/md0 ro
initrd /boot/initrd.img-2.6.8-3-386
savedefault
boot
[...]
* Mounts
# cat /etc/fstab
# <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 /var/mail ext3 defaults 0 2
/dev/hda5 none swap sw 0 0
/dev/hdc5 none swap sw 0 0
/dev/hdd /media/cdrom0 iso9660 ro,user,noauto 0 0
Many thanks to anyone who can help.
James.
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