ZFS regimen: scrub, scrub, scrub and scrub again.

[Wojciech Puchar]

>> gives single drive random I/O performance.
>
> For reads - true. For writes it's probably behaves better than RAID5

yes, because as with reads it gives single drive performance. small writes 
on RAID5 gives lower than single disk performance.

> If you need higher performance, build your pool out of multiple RAID-Z vdevs.
even you need normal performance use gmirror and UFS