S4048-ON iSCSI / Flow Control

I'm trying to troubleshoot an issue related to running iSCSI traffic through our S4048-ON VLT stack. I read somewhere that enabling flow-control (rx on tx off) is one of the common changes when enabling iSCSI, and I did so on all ports that handle the traffic with a "flowcontrol rx on tx off" command which I then wrote to memory.

However when I do a "show int" command, I see "Flowcontrol rx off tx off" so it looks like flow control is not active.  I do see throttles on input though.

The reason I'm trying to tweak iSCSI here is because we have a Linux system which loses connection with all Lenovo V3700 iSCSI storage about 2 hours into a backup, and I'm attempting to troubleshoot/resolve the problem.  Other systems work fine, this one does not.  I'd like to blame this server and wash my hands of it but I don't want to do so without completely ruling out the switching.

I had tried the "iscsi enable" command which reset the switch and subsequently locked me out of the management interface.  Since the hardware is remote and the storage is not Dell based, I've been investigating manual changes I can make to possibly resolve the issues.

Thanks in advance.

--Sam