[Linux-HA] Disaster Recovery with Virtual IP
dejanmm at fastmail.fm
Wed Dec 12 08:31:34 MST 2007
On Tue, Dec 11, 2007 at 07:13:31PM -0700, Jenkins, Benjamin (Ben) wrote:
> I'm using a virtual IP address with heartbeat over an RS232 cable to
> provide HA for my application today. I've now been asked to support a
> wider range of disaster recovery scenarios.
> I'm really hoping to continue using a VIP, but I know that all of the
> cluster nodes have to be on the same subnet.
No. It's OK have nodes on different subnets as long as IP traffic
is routed between them.
> I'm an application guy,
> not a data networking guy, but I believe that there are several ways to
> "extend" a subnet across geographies (VLANs, bridging, etc).
> So, has anyone had any success deploying a geographically separated
> server cluster with a VIP/Heartbeat using some of this data networking
This is tricky. The problem is split brains in case the
communication between two sites goes down. One of the tools which
may help is quorumd. There has also been discussion on the list
about the split site configurations. See also
> If so, some high level details on the data networking would be
> appreciated, especially any gotchas/hurdles to be aware of.
> Thanks in advance,
> Ben Jenkins
> Linux-HA mailing list
> Linux-HA at lists.linux-ha.org
> See also: http://linux-ha.org/ReportingProblems
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