[DRBD-user] drbd and LVM -> always getting duplicate volumes (was: can't use LVM2 on drbd devices)

Tomasz Chmielewski mangoo at wpkg.org
Thu Jan 24 20:59:44 CET 2008

Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.

Carlos Xavier schrieb:
> Hi.
> To be able to use lvm on drbd devices i had to modify the file 
> /etc/lvm/lvm.conf, to exclude the phisical devive and include the 
> logical device.
> This is what was modified:
>    # By default we accept every block device:
> #    filter = [ "a/.*/" ]
>    filter = [ "r|/dev/cdrom|", "r|/dev/sda6|", "a|/dev/drbd0|", 
> "r|/dev/sda7|", "a|/dev/drbd1|" ]

I got that problem solved, see my earlier posts.

With your setup however, if you excluded drbd devices, your LVM would 
operate on the real devices, like /dev/dm-XY (which would be in turn 
/dev/sda etc). Because of this, DRBD would not see the changes happening 
on LVM level, and your mirror is likely to be broken now?

However I'm not familiar with your setup, maybe excluding these two drbd 
devices was justified.

What does "pvs" show?

Tomasz Chmielewski

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