Re: [Xen-users] How to make network storage high available?

[Goswin von Brederlow <brederlo@xxxxxxxxxxxxxxxxxxxxxxxxxxx>]

Dominik Klein <dk@xxxxxxxxxxxxxxxx> writes:

> Hello xen-users
>
> I have a test setup with 2 xen-hosts and 1 storage host which works
> nicely. Block devices are exported from the storage host using open
> iscsi, migration works.
>
> So far so good.
>
> Now storage is a single point of failure and I want to avoid such.
>
> I read a lot on the mailing list archives and all solutions I found
> about how to make storage high available consist of at least 3-5
> components like GFS, ocfs2, iscsi, LVM, CLVM, lustre, DRBD, heartbeat
> and so on. The list of possibilities seems almost endless and each one
> is quite a challenge not only to set up, even more to handle later on.
>
> What I would like to know is how people really use Xen guests on
> network storage and how they make storage high available. Any "easier"
> setups?
>
> I am aware that this is somewhat asking for a lot without seeming to
> want to do a lot for it, but I thought that asking couldn't mind.
>
> I like things simple and the setups I found in tutorials seem very
> complex to handle. They may work out of the box from such a tutorial,
> but what to do when something fails? So that's kind of why I ask.
>
> Regards
> Dominik

I'm testing with 2 server with drbd 0.8 in actice-active mode and clvm
for this. But drbd is indeed complex to handle.

You don't need gfs or ocfs2 if you only ever have one domain accessing
an fs.

MfG
        Goswin

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