> > The real performance problem with RAID 5 won't show up until a drive
> > dies and it starts rebuilding
>
> I don't agree with that. RAID5 is very slow for random writes, since
> it needs to :
"The real problem" is when RAID5 loses a drive and goes from "acceptable"
kind of slow, to "someone's fired" kind of slow. Then of course in the
middle the rebuild, a bad sector is discovered in some place the
filesystem has never visited yet on one of the remaining drives, and all
hell breaks loose.
RAID6 is only one extra disk...