RH 6.0 and Linear RAID

[Bob Tanner <tanner@real-time.com>]

I am trying to set RH 6.0 and linear RAID. I had this working fine under RH
5.0, but 6.0 makes some changes and I cannot get things to work.

First, it does not look like the kernel detects my raid disks. According to
the HOWTO I need to have all RAID partitions have a type of "fd".

   1. fdisk does not allow my to set my partition type to "fd".
   2. I used cfdisk and this got me through the problem.

Anyone know why fdisk does not support type "fd"?

So, I have 3 partitions of type fd ready to make into a RAID array.

/dev/sda5            18       239   1783183+  fd  Unknown
/dev/sdb1             1      1106   8883913+  fd  Unknown
/dev/sdc2            34      1115   8691165   fd  Unknown

I rebooted to make sure.

Here is my /etc/raidtab:

raiddev /dev/md0
        raid-level      linear
        nr-raid-disks   3
        persistent-superblock 1
        device          /dev/sdc2
        raid-disk       0
        device          /dev/sdb1
        raid-disk       1
        device          /dev/sda5
        raid-disk       2

I make sure the kernel knows about RAID:

# cat /proc/mdstat 
Personalities : 
read_ahead not set
unused devices: <none>

Activate the RAID array:

# mkraid /dev/md0
handling MD device /dev/md0
analyzing super-block
disk 0: /dev/sdc2, 8691165kB, raid superblock at 8691072kB
disk 1: /dev/sdb1, 8883913kB, raid superblock at 8883840kB
disk 2: /dev/sda5, 1783183kB, raid superblock at 1783104kB
/dev/md0: Invalid argument

Any ideas why this is not working?

I thought the cat /proc/mdstat would give me a value for Personalities : , but
it doesn't.


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Bob Tanner <tanner@real-time.com>       | Phone : (612)943-8700
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