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Re: SS4000-E (Lack of) Performance

Hi Danny,

I am not able to help you with your question but would like to know
what size disks you are using. I put 4x1TB drives in mine but the unit
freezes building the raid. I tried 750G disks with the same effect. I
will buy 500gig disk if I know this works. what is wierd for me is why
the size of the disk would matter at all?



On Thu, May 13, 2010 at 1:55 AM,  <danny.rodriguez@comcast.net> wrote:
> Hi all -
> Thanks to the work of many on this mailing list, I've been able to install
> SID (w/ kernel 2.6.32-5) on my SS4000-E NAS.
> Much to my surprise, the performance of the unit is pretty much identical to
> how it was running the proprietary Falconstor implementation.
> hdparm -tT /dev/sda reads :
> /dev/sda:
>  Timing cached reads:   128 MB in  2.00 seconds =  63.93 MB/sec
>  Timing buffered disk reads:  114 MB in  3.04 seconds =  37.44 MB/sec
> The results from hdparm are static across all 4 drives.
> Needless to say -- these numbers are atrocious.  Max throughput by any means
> (NFS, FTP, etc.) is about 5MB/sec on writes to the NAS, and 8-9MB/sec on
> reads from it.
> I did come across an earlier post from "Andrushka" that stated 2.6.32 has
> DMA enabled for "this platform".  >From everything I have read, there is no
> DMA to enable/disable for SATA, but my knowledge is extremely limited in
> this arena.  He does claim that an alternative linux distro installed on the
> box got 12MB/sec out of the unit.
> (post is here:
>  http://us.generation-nt.com/ss4000e-iop-dma-help-170355901.html ;)
> I'm wondering if anyone has figured out why the performance of this unit is
> so overwhelmingly bad, or if anyone has suggestions on how to go about
> diagnosing the cause?
> Many thanks,
> Danny

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