Distributed network RAID

[Sean Carolan]

> How robust is this setup in your experience?  Quirks?  Problems?
> 
> And how difficult is it to maintain or recover from a problem with this?

I set up linux-HA and drbd on an NFS share in a VMWare lab, and yanked the 
virtual power on one box, then watched it fail over, then went back and forth 
several times in this manner.  Reading or writing to the mounted share took a 
little longer while it was doing it's failover, but no data was lost. 
Development seems robust, and they have quite a few success stories:

http://www.linux-ha.org/SuccessStories

You'll probably want to use DRBD, which basically creates a networked block 
device.  To the OS, it behaves just like your /dev/hda drive but it's actually 
writing to two or more disks over the network simultaneously.