Request for opinions - gvinum or ccd?

[Wojciech Puchar]

> should really use raidz2 in zfs (or some double parity raid on other
> systems) if you are worried about data integrity. The reason being the odds
> of the crc checking not detecting an error are much more likely these days.
> The extra layer of parity pushes these odds into being much bigger

you are right with capacity but not performance. once again - RAIDz is 
more like RAID-3 not RAID-5, RAIDz2 is somehow like RAID3 with double 
parity disk.

you will get IOps from RAIDz/RAIDz2 set not much more than from single 
drive, even on reads.

But if it's used for mostly linear reading big files you are right.