gvinum raid5 performance seems slow

[Petri Helenius]

Greg 'groggy' Lehey wrote:
>
> Single stream tests aren't very good examples for RAID-5, because it
> performs writes in two steps: first it reads the old data, then it
> writes the new data.
>   
If it really does it this way, instead doing write-only when writing 
sufficiently large blocks, that would explain the performance due to 
double rotational latency wait for each stripe size. Most 
implementations also use read/write caches to optimize this even further.

Pete