Has anyone done research into the performance of SWAP on the traditional 
partitioned based SWAP device as compared to a SWAP area set up on ZFS with a 
zvol?

 I can find no best practices for this issue. In the old days it was considered 
important to separate the swap devices onto individual disks (controllers)  and 
select the outer cylinder groups for the partition (to gain some read speed).  
How does this compare to creating a single SWAP zvol within a rootpool and then 
mirroring the rootpool across two separate disks?
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