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Date: Thu, 30 Jul 2009 12:24:48 +1000
From: Andrew Snow <andrew@modulus.org>
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Subject: Re: Cannot rm files when ZFS is full
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The performance of ZFS is quite bad when the volume is nearly full 
anyway.  I would recommend creating a parent filesystem with a space 
limit of 90% of the pool size, and then creating your other filesystems 
under that.