On a similar note, RedHat have apparently bought Sistina, and GPLed GFS. This is great news for HA under Linux, IMHO. I will be testing it soon.
Well, on their site is it listed as "open source", but it is not on sources.redhat.com (where LVM2 and device-mapper landed when they bought Sistina). In addition, it appears to only be available as part of RHEL, which is quite expensive.
I think you can get it here, http://sources.redhat.com/cluster/gfs/
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