[DRBD-user] DRBD failover between datacenters if one's network fails

Trey Dockendorf treydock at gmail.com
Tue Dec 13 22:50:07 CET 2011

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

I have somewhat of an emergency on my hands, and am hoping the community
may have some insight.  One of the primary fiber rings on my campus will be
down for a week, unless the damaged fiber fails, it will be down then.
 During this time my primary datacenter could possibly
have intermittent connectivity to other buildings / outside work.
 Unfortunately we do not have the resources for a remote data center (yet),
but for now I'm setting up a remote KVM server in a portion of campus that
will not be effected.  Currently all VMs are QCOW2 images that live on a
1.2TB Logical volume.  This seems like the perfect situation to use DRBD in
active-passive.  However I'm not currently trying to prepare for hardware
failure but network failure.  Is it possible to do this, to have the two
LVMs synced with DRBD and then have a resource manager (Pacemaker) detect
that the two can't communicate (network failure) and then activate the
passive node?  I want to avoid as much complexity as possible, so no live
migration or dual primary if possible.

This is really a temporary solution for 1 week for all
my organization's web servers, but it has made our executives aware of our
need for more funds and a remote datacenter.  So hopefully this won't be
last I can use DRBD, but I have to do this in the next 2 days.

Any help is greatly appreciated.

- Trey
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