[Xen-API] redundant xcp server with drbd

[Denis Cardon <denis.cardon@xxxxxxxxxxxxxxxxxxxxxx>]

Hello everyone,

I wanted to know if any of you had some experience with building a 
redundant xcp/xenserver cluster based on drbd. In this setup I would 
like to avoid a separate iscsi SAN, and have replicated local storage.
There are docs on the internet showing how to set up a dual primary drbd 
SR on xenserver/xcp. It works fine with live migration and all, but when 
trying disaster scenario, like severing the drbd replication link, one 
gets a split brain scenario that cannot be unsolved. It should be doable 
if xapi had a smart understanding of drbd, but currently it is just a SR 
like others. So it is a no-go for the time being.
I also tried a drbd primary-secondary scenario, with re-export with iet 
iscsi target, but for the moment I have unresolved performance issues 
(will try also with scst target).
So I wanted to know if any of you had any experience or hints with this 
kind of setup : a dual active/active XCP servers with local SR 
replicated with primary-secondary DRBD, re-exported with iscsi or aoe or 
whatever.
Cheers,

Denis Cardon

--
Denis Cardon
Tranquil IT Systems
44 bvd des pas enchantés
44230 Saint Sébastien sur Loire
tel : +33 (0) 2.40.97.57.57
http://www.tranquil-it-systems.fr


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