On Sat, May 19, 2012 at 2:17 PM, Steve Losen
<scl@virginia.edu> wrote:
> Hi all,
>
> My company just bought some Intel x520 10GbE cards which I recently
> installed into our Oracle EBS database servers (IBM 3850 X5s running RHEL
> 5.8). As the "linux guy" I have been tasked with getting these servers to
> communicate with our NetApp 6080s via NFS over the new 10GbE links. I have
> got everything working however ever after tuning the RHEL kernel I am only
> getting 160MB/s writes using the "dd if=/dev/zero of=/mnt/testfile bs=1024
> count=5242880" command. For you folks that run 10GbE to your toasters,
> what write speeds are you seeing from your 10GbE connected servers? Did
> you have to do any tuning in order to get the best results possible? If so
> what did you change?
>
> Thanks!
>
> Dan
>
Hi Dan,
Your test is a single process running a single thread. I suggest
running 10 dd jobs in parallel, writing to different files. And
as another guy suggested, also increase the block size, such as
bs=20480. That ought to drive up the total network throughput!
Steve Losen scl@virginia.edu phone: 434-924-0640
University of Virginia ITC Unix Support