[DRBD-user] Mounting a DRBD volume to bypass DRBD

Oliver Daniel DOLIVER1 at qinetiq.com
Tue Jul 28 13:11:53 CEST 2009

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

Hi there,
I'm looking to deploy a number of servers that are single nodes, but
pre-configured to be scaled into larger clusters using Pacemaker and
DRBD at a later date if required.  However, I don't want to run DRBD and
Pacemaker in a single-node cluster: we've tried this and have had a
number of trip-ups, for example DRBD dropping the backing store by
default on a read error (I know this can be changed; but my point is
that DRBD isn't intended for this).
As standard, we use DRBD volumes with internal metadata.  Ideally, I'd
like to pre-create and initialise a DRBD volume, but then mount it
directly using its LVM path.  The DRBD kernel module would not be loaded
on the system at the time.
It is my belief that so long as the filesystem is not extended, this
configuration should work because so far as DRBD is concerned the volume
has never been synced, and the contents of the volume version identifier
doesn't really matter.
Can anyone confirm this?  It would make single node -> cluster
conversion route as simple as possible whilst minimising the amount of
cluster overhead when running as a single node.

Daniel Oliver
Internet Security Engineer, Managed Services Manpower
Tel: 01684 897528, Mobile: 07766 134606
www.QinetiQ.com <http://www.qinetiq.com/> 
QinetiQ - Delivering customer-focused solutions 

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