How to enable and test Jumbo Frames in ESXi 5.1 and later.

How to enable and test Jumbo Frames in ESXi 5.1 and later.


Article Summary: This article provides information on how to enable and test jumbo frames in ESXi 5.1 and later.



Environment:

  • ESXi 5.1 and later

Steps to enable and test Jumbo Frames:

  • To enable Jumbo Frames in ESXi 5.1 and later:

    Jumbo frames for all iSCSI adapters in vSphere 5.1 can be configured using the UI. This applies to Software iSCSI,Dependent Hardware iSCSI and Independent Hardware iSCSI adapters.
    To enable Jumbo Frames for software and dependent hardware iSCSI adapters in the vSphere Web Client, change the default value of the MTU parameter:
    1. Browse to the host in the vSphere Web Client navigator.
    2. Click the Manage tab, and click Networking.
    3. Click Virtual Switches, and select the vSphere switch that you want to modify from the list.
    4. Click Edit Settings.
    5. On the Properties page, change the MTU parameter.

      This step sets the MTU for all physical NICs on that standard switch. The MTU value should be set to the largest MTU size among all NICs connected to the standard switch. ESXi supports the MTU size up to 9000 Bytes.
    To enable Jumbo Frames for independent hardware iSCSI adapters in the vSphere Web Client, change the default value of the MTU parameter:
    Use the Advanced Options settings to change the MTU parameter for the iSCSI HBA.
    1. Browse to the host in the vSphere Web Client navigator.
    2. Click the Manage tab, and click Storage.
    3. Click Storage Adapters, and select the independent hardware iSCSI adapter from the list of adapters.
    4. Under Adapter Details, click the Advanced Options tab and click Edit.
    5. Change the value of the MTU parameter.

  • Testing VMkernel Jumbo Frames connectivity:

    The vmkping command sources a ping from the local VMkernel port
    To initiate a vmkping test from the console of an ESX Server host:
    1. Connect to the ESX/ESXi host using an SSH session
    2. Run the vmkping command with the -s and -d options.

      # vmkping -d -s 8972 x.x.x.x
    3. Also, You can specify which vmkernel port to use for outgoing ICMP traffic with the -I option:

      # vmkping -I vmkX -s 8972 x.x.x.x


Where x.x.x.x is the hostname or IP address of the server that you want to ping and vmkX is the vmkernel port you want to test; i.e vmk1





References: iSCSI and Jumbo Frames configuration on ESX/ESXi (1007654)
Testing VMkernel network connectivity with the vmkping command (1003728)
Using ESXi Shell in ESXi 5.x (2004746)


 


Quick Tips content is self-published by the Dell Support Professionals who resolve issues daily. In order to achieve a speedy publication, Quick Tips may represent only partial solutions or work-arounds that are still in development or pending further proof of successfully resolving an issue. As such Quick Tips have not been reviewed, validated or approved by Dell and should be used with appropriate caution. Dell shall not be liable for any loss, including but not limited to loss of data, loss of profit or loss of revenue, which customers may incur by following any procedure or advice set out in the Quick Tips.

記事ID: SLN288104

最終更新日: 10/04/2013 12:00 AM


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