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

[Wojciech Puchar]

> then stored on a different disk. You could think of it as a regular RAID-5 
> with stripe size of 32768 bytes.
>
> PostgreSQL uses 8192 byte pages that fit evenly both into ZFS record size and 
> column size. Each page access requires only a single disk read. Random i/o 
> performance here should be 5 times that of a single disk.

think about writing 8192 byte pages randomly. and then doing linear search 
over table.

>
> For me the reliability ZFS offers is far more important than pure 
> performance.
Except it is on paper reliability.