Intermezzo – Can this really give me an intermediary between local filesystems and NFS?
CXFS - SGI’s clustering filesystem. SAN only?
Clustered Filesystems in General – What’s available? What’s free, what’s commercial? What are the limitations?
GFS - With shared fibrechannel storage
DRBD - Network mirroring
Dnotify – Kernel feature that allows FAM (File alteration Monitor) to work.

http://www.lambda-computing.com/projects/dnotify/
fake: provides IP-address takeover

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