[ILUG] New drives getting recognized as device mapper devices

[Walter Faleiro]

Hi,
I had two sas disk drives connected to a sunfire X4100 and used half of each
as /tmp and swap.
now when I removed them from the original system and connected it to an
alternate sunfire X4100 they get recognized as below

fdisk -l

Disk /dev/sda: 73.4 GB, 73407865856 bytes
255 heads, 63 sectors/track, 8924 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

   Device Boot      Start         End      Blocks   Id  System
/dev/sda1   *           1          13      104391   83  Linux
/dev/sda2              14        4128    33053737+  82  Linux swap
/dev/sda3            4129        5433    10482412+  83  Linux

Disk /dev/sdb: 146.8 GB, 146810536448 bytes
255 heads, 63 sectors/track, 17848 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

   Device Boot      Start         End      Blocks   Id  System
/dev/sdb1               1       17834   143251573+  83  Linux

Disk /dev/sdc: 146.8 GB, 146810536448 bytes
255 heads, 63 sectors/track, 17848 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

   Device Boot      Start         End      Blocks   Id  System
/dev/sdc1               1       17848   143364028+  82  Linux swap

Disk /dev/dm-0: 146.6 GB, 146695782400 bytes
255 heads, 63 sectors/track, 17834 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

     Device Boot      Start         End      Blocks   Id  System
/dev/dm-0p1               1       17834   143251573+  83  Linux

Disk /dev/dm-1: 146.6 GB, 146695782400 bytes
255 heads, 63 sectors/track, 17834 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

     Device Boot      Start         End      Blocks   Id  System
/dev/dm-1p1               1       17848   143364028+  82  Linux swap

Disk /dev/dm-2: 146.6 GB, 146689611264 bytes
255 heads, 63 sectors/track, 17833 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

Disk /dev/dm-2 doesn't contain a valid partition table


I cannot use /dev/sdbx and /dev/sdcx.

However I can use the drives when I do the following



dmsetup remove_all

mount -a

swapon /dev/sdc1


mount /dev/sdb1 /mnt/location


On subsequent reboot thought, the dm-0 and dm-1 is back in action and I have
to run dmsetup remove_all again.


The sunfire X4100 has its raid controller, but I am not sure if its the
system issue or the issue with the way the OS looks at the drives.


Has anyone encountered this before?


--Walter