We have started to experience high network latency when our newer Dell EMC Unity SANs replicate across the network. All of the SANs and the network switch that the SANs and the VM host servers are connected to are all configured for jumbo frames. All devices have an MTU configured of 9216. However the next hop up switch and then the L3 device that does routing are not configured for jumbo frames.
The distribution layer switch is a Dell S4048-ON switch which I should be able to enable jumbo frames on. However our L3 device for this office is a HA pair of Sophos XG430 devices. The way the S4048-ON switch connects to the XG430 in its LAN LAG will not allow for the configuration of jumbo frames.
Would it be best to move the L3 connectivity for our iSCSI traffic down to the S4048-ON switches and then route that traffic through the XG430? Letting the S4048-ON device handle the breakdown of jumbo frames to the 1500 byte payload for cross network replication?
When our replication process starts pings that are routed across the network go from <1ms to over >200ms. All pings on the same subnet stay under <1ms.
Thanks for any recommendations.
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