Disappointing performance of copy (MD raid + XFS)

[Asdo]

Asdo wrote:
> and I think I have seen around 10MB/sec when they are of 500KB (this 
> transfer at 10MB/sec was in parallel with another faster one however). 
Yes I definitely confirm: right now I have just 1 rsync copy running, 
it's in a zone where files are around 500KB on average, and it's going 
at 9 MB/sec.
Stack traces of the writer process conform to what I have posted in my 
previous email, even now that the writer is the only process using the 
destination array.