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

Hi there maybe have a look at GlusterFs -

We have a running setup here (8 Nodes, 100 VMs) that share localstorage - but we use GlusterFS (running in Dom0 - yes something you should not do under no circumstances I know) instead of DRBD - and of course there is no iSCSI or other block-level storage in this set-up but NFS or just a BIG folder of apparently local Storage using native glusterFS that works well by now

  -  maybe you'll have alook at such an option ...


Andreas Balg

Am Dienstag, 06. März 2012 11:22 CET, George Shuklin <george.shuklin@xxxxxxxxx> schrieb:

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

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