Re: SS4000-E (Lack of) Performance
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, <email@example.com> 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 :
> 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,