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Answered Exchange 2010 and iSCSI Jumbo Frames

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      Wednesday, May 05, 2010 4:10 PM
       
       
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      I read in Jim McBee's Mastering Exchange 2010 book that "When you're using iSCSI, the use of jumbo frames is not supported."

      Is this true? We were planning on using our iSCSI Dell EqualLogic SAN for Exchange databases/logs. We would therefore have to keep the MTU size on the nics to the default of 1500?

      Anyone with knowledge of this?

       

       

    Answers

    • Wednesday, May 05, 2010 4:45 PM
       
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      I think the book must be talking about Hyper-V Running Exchange 2010

      Configuring iSCSI storage to use an iSCSI initiator inside an Exchange guest virtual machine is supported. However, there will be reduced performance in this configuration because the network stack inside a virtual machine isn't as full-featured as a non-virtualized network stack (for example, a virtual network stack doesn't support jumbo frames).

      Is it so ?

      Regards

      Fazal Muhammad Khan | MCT, MCSE, MCSA, MCTS | Infrastructure Consultant, Technology Services | CDC Pakistan Ltd. | https://fazalmkhan.spaces.live.com | OFFICE: +92 21 111 111 500 Ext: 1402 | +5 GMT
      • Proposed As Answer by Fazal Muhammad Khan_ Wednesday, May 05, 2010 4:57 PM
      • Marked As Answer by Vegas588 Wednesday, May 05, 2010 6:54 PM
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    All Replies

    • Wednesday, May 05, 2010 4:45 PM
       
       Answered
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      I think the book must be talking about Hyper-V Running Exchange 2010

      Configuring iSCSI storage to use an iSCSI initiator inside an Exchange guest virtual machine is supported. However, there will be reduced performance in this configuration because the network stack inside a virtual machine isn't as full-featured as a non-virtualized network stack (for example, a virtual network stack doesn't support jumbo frames).

      Is it so ?

      Regards

      Fazal Muhammad Khan | MCT, MCSE, MCSA, MCTS | Infrastructure Consultant, Technology Services | CDC Pakistan Ltd. | https://fazalmkhan.spaces.live.com | OFFICE: +92 21 111 111 500 Ext: 1402 | +5 GMT
      • Proposed As Answer by Fazal Muhammad Khan_ Wednesday, May 05, 2010 4:57 PM
      • Marked As Answer by Vegas588 Wednesday, May 05, 2010 6:54 PM
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    • Wednesday, May 05, 2010 4:52 PM
       
       
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      Ok, that may be what he is referring to. Does that network stack limitation apply to both Hyper-V and VMware?
       
    • Wednesday, May 05, 2010 4:57 PM
       
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      I am not sure about VMWARE but yes to the Hyper-V Part

      If your post is answered than Kindly mark the post as answere so that it can be helpful for others as well

      Regards

      Fazal Muhammad Khan | MCT, MCSE, MCSA, MCTS | Infrastructure Consultant, Technology Services | CDC Pakistan Ltd. | https://fazalmkhan.spaces.live.com | OFFICE: +92 21 111 111 500 Ext: 1402 | +5 GMT