On Apr 7, 2011, at 5:22 AM, Rudi Ahlers wrote:
On Wed, Apr 6, 2011 at 7:12 PM, Eduardo Bragatto <
eduardo@xxxxxxxxxxxx> wrote:
Openfiler has HA support built in. It uses DRDB and Heartbeat to handle
replication and fail over. If you have two Openfiler boxes, you can
configure them as a cluster right from their web interface -- it seems very
simple, but this is not the Openfiler mailing list, so let's not loose focus
:)
Best regards,
Eduardo
Yes, I know it's not an OF mailing list, but I'm interested in this
kind of setup using something cheap like OF or FreeNAS
Sorry if I was unclear on what I meant.
Heartbeat is a daemon that provides cluster infrastructure
(communication and membership) services to its clients.
This allows clients to know about the presence (or disappearance!) of
peer processes on other machines and to easily exchange messages with
them.
In order to be useful to users, the Heartbeat daemon needs to be
combined with a cluster resource manager (CRM) which has the task of
starting and stopping the services (IP addresses, web servers, etc.)
that cluster will make highly available. Pacemaker is the preferred cluster resource manager for clusters based on Heartbeat.
Basically DRDB works by replicating everything you write to your disks, via network, to another storage box.
Heartbeat runs on both OF boxes and it keeps monitoring for their presence. If one of the storage servers goes down, the other one will pick up the IP used by the box that just "disappeared" so your clients can still reach the storage server on the same IP with the same data they had on the failed storage server.
This is all handled by OF itself, you only need to do setup two OF boxes in HA cluster via it's web interface.
Best regards,
Eduardo Bragatto.
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