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Re: [Linux-cluster] Quorum disk over RAID software device



Thomas Meller wrote:
Many thanks, Gordan.

This could nearly be the solution.
But as I understand, it's not possible to mirror the root-(g)fs to another
computing center despite for relying on a new SPOF (if at all possible)
or on hardware-dependent solutions.

Not sure I follow what you mean. If your underlying storage is synchronously mirrored, you should have no problem with GFS root on top of it. If things disconnect, of course, it'll split-brain, and one node will get panicked and need rebooting.

If your mirrored SAN can't handle it gracefully, you could always use DRBD to handle the real-time mirroring. That will even re-direct to the remote storage node in case just the local storage fails.

Since I added the DRBD functionality to OSR, I'm pretty sure it works. ;)

Hmm... our current setup addressed this with half the effort.

If you need more graceful recovery from network outages (especially the cross-site interconnect), you could use something like GlusterFS + OSR. I contributed patches for that, too, but it's a bit experimental.

Anyway, does anyone in this forum use this technique and can send me
the 'init'-script from the initrd?

I'm still not entirely sure what exactly you're looking for. Can you elaborate a bit more?

Gordan


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