[ILUG] New drives getting recognized as device mapper devices

[Conor Wynne]

On Mon, Oct 20, 2008 at 5:04 AM, Walter Faleiro <curtorkar at gmail.com> wrote:

> 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?


No experience with sunfire boxen, but I would try and add them to a logical
volume, and create swap and ext3 inside.

run your dmsetup remove_all command first, then :

1. remove the partitions as you don't need them.
fdisk them and clear all.
2. pvcreate /dev/sdb /dev/sdc
(as opposed to /dev/sdb1 & sdc1)
3. vgcreate, lvcreate, mkswap & mke2fs em.

Reboot and see if the issue remains. Bet it goes away.


>
>
>
> --Walter
> --
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>

Conor.