[DRBD-user] becoming primary with outdated data

Lars Ellenberg lars.ellenberg at linbit.com
Tue Mar 23 15:16:52 CET 2010


On Mon, Mar 22, 2010 at 09:39:00AM -0500, Alex Dean wrote:
> I'm using drbd 3.3.7 + heartbeat 3.  I've configured dopd using
> http://www.drbd.org/users-guide/s-heartbeat-dopd.html.  It works as
> expected.  If I pull the ethernet cable used for drbd replication, I
> see dopd activity in heartbeat's logs, and the secondary's dstate
> changes to 'Outdated'.
> 
> Is it somehow possible to force drbd to become primary with this
> outdated data?  I'm thinking if there is an unnoticed (failure of
> monitoring, perhaps?) failure of the replication link, and then
> there is some catastrophic failure on the primary which renders its
> data unusable, it might be preferable to go forward with promoting
> the outdated secondary to primary status.  I understand this means
> lost data.
> 
> I've been reading through the man pages for drbdadm and drbdsetup,
> as well as the DRBD Users Guide, and haven't found anything
> describing how to do this.  Can it be done?

Prior to 8.3.8, you'd have to fiddle with drbdmeta set-gi.
Starting with drbd 8.3.8 (which has not been released yet,
so read "current git", if you like) a simple --force primary
will do.


-- 
: Lars Ellenberg
: LINBIT | Your Way to High Availability
: DRBD/HA support and consulting http://www.linbit.com

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