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Date: Mon, 14 Jul 2008 21:28:09 -0400
From: Steve Bertrand <steve@ibctech.ca>
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Subject: Calculating disk space with ZFS
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Hi all,

I'm configuring Amanda over ZFS, with plans for a five 'tape' diskless 
cycle.

When I'm calculating the size of each 'tape', should I divide up my 
dedicated backup space based on a 'df -h', or a 'zpool list'?

Assume that if I go by the 'zpool list' command, I'd like to allocate 
1.8TB, divided by five to tapes. Should I use this number, or would it 
be more appropriate to slice up the space based on the 'df -h' below? 
I'm assuming the latter, but I'd just like to ask for clarification.

amanda# zpool list
NAME                    SIZE    USED   AVAIL    CAP  HEALTH     ALTROOT
storage                1.82T   2.86G   1.82T     0%  ONLINE     -

amanda# df -h
Filesystem    Size    Used   Avail Capacity  Mounted on
storage       1.3T    2.1G    1.3T     0%    /
devfs         1.0K    1.0K      0B   100%    /dev

Regards,

Steve