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To increase throughput and performance, it is recommended to use MTU 9000 instead of the default MTU 1500. In order to use MTU 9000, all network switching and routing elements between the SoftNAS Cloud® VM and the client device must support MTU 9000.

Note that for MTU 9000 to work properly, it must be configured on all physical switch ports, routers, host servers and virtual switches (and within SoftNAS Cloud® network interfaces). Be sure to verify networking paths and hosts end to end in order to use MTU 9000 (or it can actually reduce performance and potentially cause packet loss or retries if not configured properly).

EC2 Users - Due to the specific ways in which EC2 physical servers and networking infrastructure are configured, some of the physical hosts support jumbo frames, and others do not. On physical hosts that support jumbo frames, AWS will push the 9001 MTU setting through to the virtual machines on that physical host. On the ones that don't, AWS will not push that 9001 MTU setting. This info is tucked away in AWS docs at Amazon Docs Instance Types "The maximum transmission unit (MTU) for an instance depends on its instance type. The following instance types provide 9001 MTU (jumbo frames): CC2, C3, CG1, CR1, G2, HS1, HI1, I2, and M3. The other instance types provide 1500 MTU (Ethernet v2 frames)."

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1. Log on to SoftNAS StorageCenter.
   
   
2. In the Left Navigation Pane, select the Network Settings option under the Settings section.
   The Network Settings panel will be displayed. Configure and manage all network configuration from here. 
   
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3. Click the Network Interfaces icon.
   The Network Interfaces section of the panel will be displayed. 
   
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4. Click the Activated at Boot tab.
   
   
5. Select the network interface (eth1) in the list of the interfaces.
   The Edit Bootup Interface section of the panel will be displayed. 
   
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6. In the MTU field, change the value from default to 9000. In order to do so, check the option for the text entry box and enter the value 9000 in the text box.
   
   
7. Click Save and Apply.
   
   
8. Back in the Network Interfaces panel, click the Active Now tab. 
   
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9. Select the interface name (eth1).
   The Edit Active Interface section of the panel will be displayed.
   
   
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10. In the MTU field, enter the value as 9000 in the text entry box. This will change the current network interface value to MTU 9000. Be sure that all switching paths are configured to support MTU 9000 before making this change (or risk losing connectivity).
    
    
11. Click Save. 

Configuring VMware vSphere for MTU 9000

Before enabling jumbo frames, ensure the following are true:

• The physical server's network interface card and network switch can support jumbo frames (MTU 9000)
• The switch ports of all routers and switches between SoftNAS Cloud® and VMware vSphere hosts are properly configured for MTU 9000.

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