[DRBD-user] Having Trouble with LVM on DRBD

[Eric Robinson]

That’s what I get for having worked with drbd for so long. I forgot to RTFM.

--
Eric Robinson

From: Igor Cicimov [mailto:icicimov at gmail.com]
Sent: Thursday, February 25, 2016 3:14 PM
To: Eric Robinson <eric.robinson at psmnv.com>
Cc: Trevor Hemsley <themsley at voiceflex.com>; drbd-user <drbd-user at lists.linbit.com>
Subject: Re: [DRBD-user] Having Trouble with LVM on DRBD



On Fri, Feb 26, 2016 at 10:10 AM, Eric Robinson <eric.robinson at psmnv.com<mailto:eric.robinson at psmnv.com>> wrote:
> The usual problem with LVM on top of DRBD is that the
> backing device gets seen as an LVM PV and is grabbed by
> LVM before DRBD starts up. That means DRBD cannot access
> it since it's already in use. Solution: adjust the filter
> lines in lvm.conf to exclude the backing devices from
> LVM consideration.
You mean /dev/drbd0 and /dev/drbd1?

--Eric

The instructions are here: https://drbd.linbit.com/users-guide/s-lvm-drbd-as-pv.html
Then in pacemaker, example from one of my clusters:

primitive p_lvm_vg1 LVM \
    params volgrpname=vg1 \
    op monitor interval=60 timeout=30 \
    op start timeout=30 interval=0 \
    op stop timeout=30 interval=0 \
    meta target-role=Started
colocation c_vg1_on_drbd +inf: g_vg1 ms_drbd_vg1:Master
order o_drbd_before_vg1 +inf: ms_drbd_vg1:promote g_vg1:start
to tide them up and start the volume on the drbd master.
Hope this helps.
Igor

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