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LUCKY1011
Enthusiast
Enthusiast
‎08-17-2023 03:39 AM

Recommendation

To test the MTU size of 9,000, the database was running an OLTP workload while the virtual machine was moved using vMotion to another server. We captured the time to vMotion the server as well as New Orders per Minute (NOPM) and Transactions per Minute (TPM) for analysis. Increasing the MTU size showed significant gains for these metrics:

  • vMotion time to complete
  • NOPM
  • TPM

A larger MTU size of 9,000 reduced the time to complete moving the database with an active workload compared to the default MTU size of 1,500. This impressive time-saving function led us to label this best practice as a Day 1, Highly Recommended procedure. 

NOPM and TPM also increased, but not as substantially as the vMotion time savings. The overall benefit of this best practice is that database performance has greater consistency during vMotion with a substantial time-savings in moving the database. 

Implementation Steps

Process to configure MTU size = 9000 for vMotion network

  1. Configure MTU Size = 9000 at vMotion Distributed Switch
    1. To change at vMotion distributed switch level, select the distributed switch for vMotion in networking tab in vSphere and select setting
    2. In the Edit setting, select Advanced and change the MTU to 9000
    3. Click OK to save the change
  1. Configure MTU Size = 9000 at VMKernel Adapter
    1. Login to vSphere and select the EXSi host, and click the Configure tab 
    2. Select the VMkernel adapters 
    3. Under VMkernel adapters, select the Motion network and click Edit
    4. In the Edit Settings, under VMkernel port settings, change the value of MTU from 1500 to 9000.
    5. Click OK to save the change
    6. Repeat the same steps above on another host
  1. Configure MTU Size = 9216 at Physical Switch
    1. To change at switch level, show running configuration interface ethernet (Run this to find port rang
    2. Configure Terminal
    3. Interface range ethernet "enter the port range" (eg:1/1/25 -1/1/2
    4. mtu 92
    5. Exit
    6. Write memory to save the configuration

Note: To change it at network switch level, login into switch console and update the MTU

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