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From: Ivan Voras <ivoras@freebsd.org>
Date: Mon, 13 Dec 2010 14:27:33 +0100
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Subject: Re: what is the best way to use free space on several boxes?
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On 13/12/2010 14:08, Zeus V Panchenko wrote:
> Ivan Voras (ivoras@freebsd.org) [10.12.09 17:15] wrote:
>>
>>  From one side, you can simply create large files within the existing
>> file systems (e.g. a 300 GB file on each) to serve as virtual disks,
>> export them with iSCSI, import them on another box and create a ZFS
>> raidz volume out of those drives - you get a small amount of fault
>> tolerance here. The bad sides are: you need to have a large "fixed
>> space" file on each of the machines (you can theoretically create sparse
>> files but the downsides are even worse), only one box can see the
>> consolidated space (the ZFS volume),
>
> what if i set cluster of FreeNAS-es and export to it the files as ZFS space?

If the machines are used by nothing else except FreeNAS, it makes things 
somewhat simpler since you don't have to share the space. It would work, 
probably similar to what I've described.