devices in /proc/mdstat ? (Ubuntu 5.04)

[Kristian Vilmann]

Greetings!

I have a server with four scsi-disks in it.
It's configured with lvm on top of softwareraid (RAID 1)
Now I recieve a lot of errors from /dev/sdb i the logs, and I would like 
to disable it until I get a new disk.

But how do I locate /dev/sdb from this:

$ cat /proc/mdstat
Personalities : [raid1]
md2 : active raid1 dm-12[1] dm-11[0]
       69167744 blocks [2/2] [UU]

md0 : active raid1 dm-7[1] dm-6[0]
       71127680 blocks [2/2] [UU]

md1 : active raid1 sdd1[0] sda1[1]
       979840 blocks [2/2] [UU]

unused devices: <none>
$

md1 is from an older debian-installation, but md0 and md2 was created 
when ubuntu was installed.

I can find the major/minor numbers:
$ cat /sys/block/dm-12/dev
253:12
$

Now, looking in /dev/mapper/ I find some different major/minor numbers:
$ ls -l /dev/mapper/
total 0
crw-rw----  1 root root  10, 63 2005-11-24 00:28 control
brw-------  1 root root 253,  1 2005-11-24 00:28 vg_data-lv_home
brw-------  1 root root 253,  0 2005-11-24 00:28 vg_data-lv_var
brw-------  1 root root 253,  2 2005-11-24 00:28 vg_data-lv_www
brw-------  1 root root 253,  5 2005-11-24 00:28 vg_sys-lv_backup
brw-------  1 root root 253,  4 2005-11-24 00:28 vg_sys-lv_usr
brw-------  1 root root 253,  3 2005-11-24 00:28 vg_sys-lv_var
$

And then I'm stuck.

Where should I look to find out which RAID 1-device uses /dev/sdb ?

What documentation should I read?
Pointers will appreciated.

/kristian
-- 
Kristian Vilmann
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