Strange aggregate BW

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Hello,

I’ve got a HWRAID with 10 NL-SAS HDDs.
All of them used in logical volume RAID6.
I’ve tried to benchmark created volume with FIO v2.1.4:

# cat seqwrite.fio
[write]
blocksize=512k
filename=/dev/sda
rw=write
direct=1
buffered=0
ioengine=libaio
iodepth=1
runtime=10m
numjobs=16

#./fio seqwrite.fio

FIO returns:
...
Run status group 0 (all jobs):
  WRITE: io=127958MB, aggrb=2132.5MB/s, minb=56530KB/s, maxb=229141KB/s..

2132 / 10 ~ 200 MB/s per HDD, is that possible???--
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