Bug#510911: multipath-tools: bad side effects with FC devices

[Guido Günther]

On Tue, Jan 06, 2009 at 08:50:28AM +1100, Vincent McIntyre wrote:
> Other things I noticed:
>  - fdisk works ok
>    # fdisk -l /dev/sdc
>    Disk /dev/sdc: 1505.9 GB, 1505973239808 bytes
>    64 heads, 32 sectors/track, 1436208 cylinders
>   Units = cylinders of 2048 * 512 = 1048576 bytes
>
>      Device Boot      Start         End      Blocks   Id  System
>   /dev/sdc1               1     1436208  1470676976   83  Linux
Once you use multipath you have to access multipathed devices via
/dev/mapper/<wwid> or via /dev/disk/by-id/. Not doing this is the only
bug here I can see.

>  - once booted, /dev/mapper is left in a very odd state indeed:
>    # ls -l /dev/mapper
>    brw-rw---- 1 root disk 254,  8 2009-01-05 14:35
>    36000393000007d3901000000fef00a2d
>    brw-rw---- 1 root disk 254,  9 2009-01-05 14:35
>    36000393000007d3901000000fef00a2d1
>    brw-rw---- 1 root disk 254,  7 2009-01-05 14:35
>    36000393000007da901000000fef00a2d
It seems multipath tools picked up your devices correctly. What did you
expect to happen?
Cheers,
 -- Guido