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Configuring the Network to Enable Jumbo Frames

Applies To

 

Product(s): T445, T540, T6xx, T8xx

Product Version(s): Tintri OS v1.4 (and later).

Symptoms

 

If the network is not properly configured for use with Jumbo Frames, some traffic (NFS mount, pinging) may be successfully transmitted/received while other traffic (browsing the datastore, deploying a VM) will fail.

Resolution

 

Configure MTU on devices and ports between Tintri VMstores and ESX hosts to enable jumbo frames.

 

Enabling Jumbo Frames in the data network settings via the Tintri Web UI changes the data network MTU value from 1500 to 9000. This change can increase efficiency by allowing larger packets containing more data to be sent while networking and protocol overhead remains fixed. Note: Performance benefits are questionable with modern network implementations.

 

The MTU value is negotiated between the source and destination to ensure safe transmission. If the MTU value on the Tintri VMstore and ESX host do not match, the smaller of the MTU parameter values is used. This will prevent packets that are larger than can be safely handled from being sent/received. If the MTU value on the Tintri VMstore and ESX host is a match, the configured MTU value is used. In most cases, one or more switches, routers, etc. will be deployed between the source and destination. If any of these network devices are configured to use an MTU parameter lower/smaller than the value negotiated between the Tintri VMstore and ESX host the result will be dropped or truncated data packets.

 

To confirm that an MTU mismatch is causing the disruption, disable Jumbo Frames in the data network settings via the Tintri Web UI. This will force the use of MTU 1500. If functionality is restored, an MTU mismatch exists on the network between the Tintri VMstore and ESX host.

 

Check the MTU configuration on each device and port in use between the Tintri VMstore and ESX host. Configure each to match the MTU parameter as configured on the Tintri VMstore and ESX host.

 

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Added link as an update as the naming convention for ESX has changed to ESXi.
Posted 11:20, 10 May 2017
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Last modified
11:19, 10 May 2017

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