3 Replies Latest reply: Jan 18, 2014 4:18 PM by rmatsumoto RSS

FAS3140 slow disk speed on Windows Host

XARIS_SMSM
Currently Being Moderated

hello all,

quick question please


i have a Windows 2012 R2 Server and i have connect a lun from a FAS3140 via FC 4GB/ports (MS native MPIO is configured and tested)


the lun from the FAS is from an aggregate that have SATA disks (about 20 TB) the lun is 15 GB (ALUA is enabled and default config applied on vol/lun on the storage side)


testing the speed on the windows server drive (15GB lun) with a common utiliy the "hd_speed" i get very low throughput not above 140 MB/s on a 64k block size on the disk provided from the FAS (15GB lun)


comparing these speed with a common desktop with a single SATA drive rising the speed around 120MB/s on the same block size i am a little confused/cautious if the lun speed provided from the FAS on the Windows Server is normal or not..?

 

I would expect better and faster speeds from an enterprise storage


any feedback/comments will be welcome


Regards

  • Re: FAS3140 slow disk speed on Windows Host
    dburkland
    Currently Being Moderated

    Could you elaborate on what type of IO you are generating when using the benchmarking tool? (Sequential/Random for example).

     

    Dan

    • Re: FAS3140 slow disk speed on Windows Host
      XARIS_SMSM
      Currently Being Moderated

      hi thanks for the response

       

      using hdspeed utility i get sequential read 130 to 140 MBs at 64k block size

       

      using Parkdale utility at 64k block size check the results above

       

      equential read speed: 142 MB/s

      Radom QD32 2,9MB/s - 754 IOPS - 1.33ms

       

      my regards

      • Re: FAS3140 slow disk speed on Windows Host
        rmatsumoto
        Currently Being Moderated

        Some tasks won't perform all that much better on SAN than DAS(even spinning disks).  I have no idea how else to describe/categorize what's what, but that's been my observation.  One of them being a certain database application(not the famous ones ).  But there are a couple of things to keep in mind:

         

        1. Did you check the latency?  I'd collect a perfstat and have NetApp tell you if volume and LUN latency counters are reporting high numbers.  With your setup, at that number, both counters should be pretty low.  If that's the case, then the delay is somewhere beyond your storage.

        2. Did you tweak thread count/parallelism?  I don't know about the tool you're using, but these stress test tools usually let you play with thread count/block size/data size/file count/random-ness/read% vs write%.

        3.  At the risk of sounding like a NetApp apologist(I'm a customer), could some of this be on your tool?  A few of our HA pairs are like yours(32xx with SATA aggrs) and a Microsoft stress tool for Exchange 2010 POC pumped out 800+MB/s without the latency hitting 10ms and the bottleneck was that the links were 2x 4Gbps.  I think these numbers you and I get can depend on the tools and their settings. 

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