[Linux-cluster] Quorum disk over RAID software device
gordan at bobich.net
Fri Feb 5 15:18:07 UTC 2010
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?
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