Re: [Xen-API] redundant xcp server with drbd

[George Shuklin <george.shuklin@xxxxxxxxx>]

Good day.

We've tried that for internal laboratory. Problem: sometime drbd do 
additional IO and making storage out of sync. We've spend few weeks on 
this set up (primary/primary drbd, and iscsi export with LVMoISCSI SR), 
but  it getting unstable after some time, so we gave up.


On 06.03.2012 13:47, Denis Cardon wrote:
> 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

_______________________________________________
xen-api mailing list
xen-api@xxxxxxxxxxxxx
http://lists.xen.org/cgi-bin/mailman/listinfo/xen-api