I'm trying to setup iSCSI over an X670, between a Windows host and an Equallogic PS4100 array
The Equallogic box is connected on a single gig port via a 1000T SFP, the Windows box has an Intel X520 10gig card installed, using a 3m twinax cable. Both of those have jumbo frames enabled.
On the x670 I have "enable jumbo-frame ports all" set. I've created a new VLAN and untagged it on the ports for both units.
From the server I can ping the Equallogic unit, "ping -l 8000 ip.ad.re.ss" works ok. When mounting an iSCSI volume and running Wireshark I can see lots of 'TCP Dup ACK', 'TCP Window Update' and 'TCP Retransmission' events, after a few seconds the drive hangs.
* Slot-1 LL_10G_STACK1.87 # show port 1:20,1:34 information
Port Flags Link ELSM Link Num Num Num Jumbo QOS Load
State /OAM UPS STP VLAN Proto Size profile Master
esxstg1_> Emj-----e--fMB---b active - / - 6 0 1 1 9216 none
eqlarr1_> Emj-----e--fMB---b active - / - 1 0 1 1 9216 none
Any ideas? If I connect the Windows box up via a gig cable direct to the array the performance is fantastic.