Under the “iSCSI network rules” section of https://www.dell.com/support/manuals/en-us/powervault-me5084/me5_series_sm/me5-series-storage-system-rules?guid=guid-3e9e84a0-66b9-4df8-bd6b-13461a338c9b&lang=en-us it recommends that flow control should be “enabled for both sending and receiving on all switch ports and server NIC ports.”

However, under the “Ethernet switch specification recommendations for iSCSI traffic” section of https://www.dell.com/support/kbdoc/en-ca/000201155/me5-troubleshooting-iscsi-controller-ethernet-port-link-down it only mentions enabling receive-side flow control (i.e. not transmit).

Similarly, the same document says that PowerVault ME switch configurations are similar to the configurations for SC series arrays, and the SC switch configuration guide (https://dl.dell.com/manuals/common/dell-emc-networking-s5148f-on-scg-sc-ps-series-scg3928.pdf) says to turn transmit flow control off (with receive on).

Which is correct? Should we have flow control for both transmit and receive turned on for each switch port handing iSCSI, or just receive?