MD by HB management; was: [DRBD-user] Why isn't DRBDrecognized as valid LVM PV?

Lars Ellenberg lars.ellenberg at
Fri Mar 14 12:56:38 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.

On Fri, Mar 14, 2008 at 10:31:11AM +0100, Ralph.Grothe at wrote:
> Hi Lars,
> thanks for the reply.
> Btw, I remember to have met you once at the LinuxConf EU 2007
> where we shared a taxi from 
> Cambridge railway station.

right. has been a nice conference there.

> May I ask you somewhat astray,
> although I'm sure that this is probably in great depth pointed
> out somewhere in the docs,
> if with my brand new DRBD 8.2.5 installation I could activate the
> DRBD primary on both nodes simultaneously
> and have the concurrent write accesses from both nodes be warded
> by some sophisticated locking mechanism,
> as is presumably provided by e.g. GFS or OCFS2 etc.?
> Currently this cluster is HB1, active/standby.
> Inspite of shifting to HB2, which I fear would have to be paid
> with the loss of ease of administration,
> I rather fancy to instead have HB1 manage shared storage in guise
> of a DRBD+GFS combo
> along with an LVS load balancer.
> This shared storage should then be used by a varying number of
> web services/apps
> which I would like to provide in OpenVZ VEs running on the same
> cluster nodes,
> but which wouldn't have to be HA (i.e. not HB managed).
> This may sound pretty awkward because one usually separates the
> LVS cluster from the services behind it 
> which are forwarded to.
> And I know that trying to escape HW costs this way while trying
> to maintain HA at the same
> must be like a contradiction in itself.
> But anyway, do you think this could work at all,
> and would make any sense?

speaking of "ease of administration", you will
lose a lot of that with a two-primary drbd setup.
anyways, see if  the
helps, feedback wellcome.

: Lars Ellenberg                  :
: DRBD/HA support and consulting             sales at :
: LINBIT Information Technologies GmbH      Tel +43-1-8178292-0  :
: Vivenotgasse 48, A-1120 Vienna/Europe     Fax +43-1-8178292-82 :
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