[linux-lvm] LVM mapper and device names

[linux-lvm] LVM mapper and device names

[Markus Baertschi]

I'm confused on how to navigate forth and back between
the /dev entries of lv's and what dm makes of it.

If I craeate a lv 'work' in my vg 'datavg' I'll get a /dev
entry /dev/datavg/work to work with (mount/mkfs, etc).
But after mounting a 'mount' shows the same lv as
/dev/mapper/datavg-work.

Example:
root@altair:~# lvdisplay /dev/datavg/work
  --- Logical volume ---
  LV Name                /dev/datavg/work
...
root@altair:~# mount /dev/datavg/work /work
root@altair:~# mount | grep work
/dev/mapper/datavg-work on /work type jfs (rw)

When I now have a mounted filesystem, how can I
determine reliably which is the original lv I've used ?
Do I have to dissect what 'mount' shows or is there
an official way to do it ?

Markus
-- 
  Markus Baertschi             Phone: ++41 (21) 807 1677
  Bas du Rossé 16             Fax  : ++41 (21) 807 1678
  CH-1163, Etoy                Email: markus@markus.org
  Switzerland                  Homepage: www.markus.org

Re: [linux-lvm] LVM mapper and device names

[Alasdair G Kergon]

On Sat, Jan 03, 2009 at 05:55:37PM +0100, Markus Baertschi wrote:
> /dev/mapper/datavg-work on /work type jfs (rw)
 
> When I now have a mounted filesystem, how can I
> determine reliably which is the original lv I've used ?

lvs -o vg_name,name /dev/mapper/datavg-work

Alasdair
-- 
agk@redhat.com

Re: [linux-lvm] LVM mapper and device names

[Martin Schröder]

2009/1/3 Alasdair G Kergon <agk@redhat.com>:
>> When I now have a mounted filesystem, how can I
>> determine reliably which is the original lv I've used ?
>
> lvs -o vg_name,name /dev/mapper/datavg-work

Volume group "mapper" not found

> sudo /sbin/lvs --version
  LVM version:     2.02.13 (2006-10-27)
  Library version: 1.02.12 (2006-10-13)
  Driver version:  4.7.0

Best
   Martin

Re: [linux-lvm] LVM mapper and device names

[Alasdair G Kergon]

On Sat, Jan 03, 2009 at 07:35:50PM +0100, Martin Schr�der wrote:
> Volume group "mapper" not found
 
>   LVM version:     2.02.13 (2006-10-27)

Time to update then - that one's over two years old:-)
It got added in March 2007.

Alasdair
-- 
agk@redhat.com