The trick seemed to be using mdadm to bring the array up:
mdadm -B /dev/md/d0 /dev/hdc /dev/hdd --level=raid0 --raid-devices=2
The node for the d0p1 block device was not auto-created even though I have devfs, but after creating one for "254,1", I was able to mount the partition.
This is wonderful, and hopefully I can get small bit of info in the RAID FAQ or HOWTO about it. I didn't see anywhere a reference to being able to start a Promise Fasttrak array with just the Linux RAID code. :)
-Aaron Longfield
Ricky Beam wrote:
On Thu, 1 Jul 2004, Aaron Longfield wrote:
properly. Problem is that now I have an array that has a partition table and a partition that I can't seem to mount. Is there any way to coax the system into letting me do this? I couldn't find any documentation on it, but there seems to be support in the kernel code for the md driver.
It actually is documented... Documentation/md.txt. The "magic" is the raid device's major number: [root:pts/8]spork:~/[12:36 PM]:cat /proc/devices |grep 'md\|Block' Block devices: 9 md 254 mdp
"mdp" is dynamically allocated, so booting to a partitioned soft-raid is tricky, but certainly do able.
Simply change your raid device from /dev/md0 (which is major #9) to something with a major number matching mdp. In my case: [root:pts/8]spork:~/[12:36 PM]:ls -l /dev/md0 brw-rw---- 1 root disk 9, 0 Feb 23 16:04 /dev/md0 [root:pts/8]spork:~/[12:38 PM]:ls -l /dev/md total 0 brw-r--r-- 1 root root 254, 0 Jun 9 21:04 d0 brw-r--r-- 1 root root 254, 1 Jun 9 21:04 d0p1 brw-r--r-- 1 root root 254, 2 Jun 9 21:04 d0p2 brw-rw---- 1 root disk 254, 3 Jun 17 15:09 d0p3
[root:pts/8]spork:~/[12:38 PM]:fdisk -l /dev/md/d0
Disk /dev/md/d0: 640.1 GB, 640167510016 bytes 255 heads, 63 sectors/track, 77829 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes
Device Boot Start End Blocks Id System /dev/md/d0p1 1 72606 583207663+ 7 HPFS/NTFS /dev/md/d0p2 * 72607 77306 37752750 83 Linux /dev/md/d0p3 77307 77828 4192965 82 Linux swap
--Ricky
PS: The above naming scheme requires a small patch to grub to make it name the partitions correctly. By default, it'll look for /dev/md/d01, etc.
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