I'm taking a look at GlusterFS (not the same as lustre) which does seem 
to have great performance and is reliable, although I haven't tested 
that due to lack of hardware.

Ted Maul wrote:
> Does anyone have experience with gfs, zfs, or lustre? I'd like to 
> add/remove nodes at will and I'm wondering which fs would work best. 
> I'm not looking for blistering performance, just something that's 
> fairly reliable and easily scaled (i.e., plug in another server and 
> have it's available storage added in minutes). Suggestions outside of 
> those three are welcome.
>
>
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