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

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.


Denis Cardon

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