I am trying to setup server with RAID 1. I got RAID working but I am having problems booting from it.
Unfortunately box I am working on is quite dumb, only two drives can be connected to it and it can boot only from first drive.
I installed minimal system on first drive, I can create RAID1 on non-root partitions, and it gets detected after reboot, can be mounted, etc.
Now I want to set raid on root partition.
I created partition on second drive of exact same size as root partition on first drive. Created a degraded RAID1 array out of it (with first drive missing). Copied contents of root partition on new array (/dev/md0). Changed fstab on new partition to mount /dev/md0 as root.
First question: I copied root partition by logging into Knoppix and issuing 'dd if=/dev/hdc1 of=/dev/hdd1' command -- effectively bypassing RAID since Knoppix does not appear to have raid support. Is it ok? Or should I rather create an image from Knoppix and then dd it to /dev/md0 from Debian?
Now I am trying to figure out how to boot from raid. Since I can't really boot from second drive, I decided to try booting from first drive using raid array as root partition.
I added entry to my lilo config, named "LinuxRaid". It exactly the same as my regular "Linux" entry, with addition of "root=/dev/md0" parameter.
System starts booting fine, but at the end I get kernel panic.
Relevant log lines (note: i am retyping log by hand):
md: raid1 personality registered as nr 3 md: multipath personality registered as nr 7 md: md driver 0.90.0 MAX_MD_DEVFS=256, MD_SB_DISKS=27 device-mapper: 4.1.0-ioctl (2003-12-10) initialised: [EMAIL PROTECTED] [snip] md: Autodetecting RAID arrays. md: autorun ... md: ... autorun DONE. EXT3-fs: unable to read superblock EXT2-fs: unable to read superblock isofs_fill_super: bread failed, dev=md0, iso_blknum=16, block=32 UDF-fs: No partition found (1) Kernel panic: VFS: Unable to mount root fs on md0
When I boot from my regular root partition dmesg reports following:
md: raid1 personality registered as nr 3 md: multipath personality registered as nr 7 md: md driver 0.90.0 MAX_MD_DEVS=256, MD_SB_DISKS=27 device-mapper: 4.1.0-ioctl (2003-12-10) initialised: [EMAIL PROTECTED] [snip] md: Autodetecting RAID arrays. md: autorun ... md: ... autorun DONE. kjournald starting. Commit interval 5 seconds EXT3-fs: mounted filesystem with ordered data mode. VFS: Mounted root (ext3 filesystem) readonly. [snip] EXT3 FS on sda1, internal journal md: md0 stopped. md: bind<sdb1> raid1: raid set md0 active with 1 out of 2 mirrors
So looks to me like RAID array gets activated after root partition is mounted. Any ideas how to handle this problem?
--Kirill
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