That's easily accomplished with Pacemaker cluster manager,
there are many guides on how to do it all over the internet.
Simply said, Pacemaker controls both DRBD and ISCSI targets
and if the slave node detects master's failure - it promotes
DRBD to primary, brings up shared ip address and starts ISCSI.
But your problem can be, i think, solved much simpler:
you just need to rsync your ISO's to another server, because,
as i see it, they are changed infrequently. Then you can use cluster
manager to fail over IP address between these servers.
On 04/12/14 21:44, John Moore (Compucom Systems Inc) wrote:
I have researched some about mixing DRBD an ISCSI. An what I am
finding is opinions about as vast as what people like on pizza.
So I figure I would ask it here…
Can I take 2 servers, setup DRBD between them, then configure ISCSI on
both servers but only connect to 1 of the ISCSI targets. Leave the
other ISCSI service turned off until needed. I would create a VIP
between the two servers so that the clients wouldn’t need to be
reconfigured to point to the new active ISCSI. I am looking for a
fail over file system which will hold my ISO an boot images for my PXE
environment.
DRBD would be configured to listen to a backend network using a small
1gig switch. The ISCSI would be configure to listen on the frontend
network connected to the DMZ.
John Moore
OSG VM Solutions Team
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