65165: Acronis Cyber Infrastructure: MTU cannot be increased for Broadcom NIC with bnx2x driver

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Symptoms

You are setting up Acronis Cyber Infrastructure and want to increase MTU of your Broadcom NIC with bnx2x driver to achieve best performance, but you cannot set a value larger than 3616.

Solution

Network adapters with bnx2x driver (for example, Broadcom Limited BCM57840 NetXtreme II 10/20-Gigabit Ethernet / Hewlett-Packard Company FlexFabric 10Gb 2-port 536FLB Adapter) do not perform well with high MTU values; this is a known implementation issue in the driver. For network adapters with this driver, we implemented a limitation of MTU 3616 in Acronis Cyber Infrastructure kernel. However, as setting the MTU value to recommended 9000 is not possible, these adapters do not allow best performance for our storage infrastructure solution and should not be used in Acronis Cyber Infrastructure setup. 

More information

Acronis Cyber Infrastructure core is designed to work with RedHat drivers and cannot guarantee function of another driver provided by the vendor. We recommend selecting another network adapter for your infrastructure.