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iSCSI with ESX5i

  • 1.  iSCSI with ESX5i

    Posted Feb 13, 2012 10:03 AM

    I have a problem in speed between ESX5i and MD3200i

    The speed is 6m/s

    Interfaces and iSCSI are vmnic2 vmnic3
    The network adapters are vmhba34 and vmhba35

    I'm French, sorry for mistakes

    Does anyone have an idea ?

    Best Regards

    Christophe



  • 2.  RE: iSCSI with ESX5i

    Posted Feb 13, 2012 10:17 AM

    Hi,

    try checking Network latency, between the two. As iSCSI travels over existing LAN the underlying LAN is causing the Latency. you might need to invovle your network team.

    Regards



  • 3.  RE: iSCSI with ESX5i

    Posted Feb 13, 2012 11:11 AM

    I launched the cp command from datastore2 and I'm 13m / s between the two iscsi.

    This is not very efficient

    Regards



  • 4.  RE: iSCSI with ESX5i

    Posted Feb 13, 2012 12:06 PM

    Are there any more traffic running through your LAN? 13ms is a bit slow.

    Regards, Harold



  • 5.  RE: iSCSI with ESX5i

    Posted Feb 13, 2012 12:13 PM

    Have you ever checked network MTU size and jumboframe option enabled?

    What is your broadcom iSCSI adaptor model? Is it full H/W iSCSI adaptor or S/W iSCSIbidende?



  • 6.  RE: iSCSI with ESX5i

    Posted Feb 13, 2012 12:28 PM

    Hi,

    As all your network traffic is going from one VLAN ID due to which there is the network traffic jam/Blockage.

    To work smoothly you might require to make your vmotion and management console on two different NIC / two different VLAN ID , which will make the traffice flow from two diffenet ways easily.



  • 7.  RE: iSCSI with ESX5i

    Posted Feb 13, 2012 12:34 PM

    Think this is good indication.

    iSCSI1 and iSCSI2 vmkernel ports are on the same subnet. so it would be good try to seperate these into 2 seperate subnet, hopefulle on different vswitch.



  • 8.  RE: iSCSI with ESX5i

    Posted Feb 13, 2012 05:06 PM

    Sorry but there are two host who manage the disk array as below

    it's works very well on esx4i



  • 9.  RE: iSCSI with ESX5i

    Posted Feb 14, 2012 05:32 AM

    What type of switch, how is it configured, is it dedicated?



  • 10.  RE: iSCSI with ESX5i

    Posted Feb 14, 2012 08:48 AM

    chrisfremaux wrote:

    I have a problem in speed between ESX5i and MD3200i

    The speed is 6m/s

    Could you describe the actual problem some more? The speed above, is that network latency? (Check with vmkping from inside the ESXi Shell to the iSCSI target.) Or is it some throughput of data from the iSCSI storage to the host?



  • 11.  RE: iSCSI with ESX5i

    Posted Feb 14, 2012 06:05 PM

    Please post screenshots of the VMKernel port configuration for each iSCSI port. Make sure that the iSCSI1 port has vmnic3 as it's primary, and vmnic2 as not used. iSCSI2 port should then have vmnic2 as primary, and vmnic3 as not used.

    It appears they are direct connected. Make sure there is NO way that one of the ports on either end of the cable are set to gigabit half-duplex (before I get flamed, Gb half duplex IS REAL, it's mainly for hubs and repeaters, but it's real, and it's in the spec). I've seen this happen once ever, but check it to make sure.

    If the connection is passing through a switch, please let us know what kind of switch, and how many "hops" the connection is taking to get from host to the PowerVault array



  • 12.  RE: iSCSI with ESX5i

    Posted Feb 20, 2012 08:37 AM

    Hello,

    Thank you all, the problem was the broadcom cards of Dell PowerEdgeT610.
    It must go through iSCSI software adapter vwmware esx5i.
    The speed is increased to 60MB / s

    Christophe



  • 13.  RE: iSCSI with ESX5i

    Posted May 07, 2012 12:44 PM

    impecc