df with ZFS vs. zpool list

[John Levine]

>Each of SATA-drives is about 80G in size. When using df -h I'm only
>receiving
>
>storage	145G	42k	145G	0%	/storage
>
>where I expected something like 220GB (due to the ²-issue). However,

It's raidz.  The third disk is parity for the first two.

>	NAME        STATE     READ WRITE CKSUM
>	storage     ONLINE       0     0     0
>	  raidz1-0  ONLINE       0     0     0
>	    ada1    ONLINE       0     0     0
>	    ada2    ONLINE       0     0     0
>	    ada3    ONLINE       0     0     0

R's,
John