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From: Wojciech Puchar <wojtek@wojtek.tensor.gdynia.pl>
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Subject: Re: ZFS regimen: scrub, scrub, scrub and scrub again.
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Cc: freebsd-fs <freebsd-fs@freebsd.org>,
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> "1 drive in performance" only applies to number of random i/o
> operations vdev can perform. You still get increased throughput. I.e.
> 5-drive RAIDZ will have 4x bandwidth of individual disks in vdev, but

unless your work is serving movies it doesn't matter.