If they are incrementing that should be investigated. ideally, all server connections should be the same, standard or Jumbo. Each session can be standard or Jumbo, mixing them is fine. The EQL arrays set to use them, which is negotiated at connection time. Haven't been able to try that in production yet.ĮduardK is correct.
I read on vmware forums that sometimes rebooting the switch stack will fix these packet errors also. I think dell might have a firmware issue on their hands here with 4100's at the very least.and oh, BTW, you from what I have been told by Dell, we HAVE to have jumbo frames enabled on the switches with equallogic because you cannot disable them on the SAN. The problem follows the 4100 to either controller and to any initiator talking to it. No settings on the switches or changing switch firmware change this whatsoever neither does changing patch cords or any other hardware. The PS4100 has 1-2% packet errors, hence tcp retransmissions and 200-500ms read latency and nearly 0ms write latency. In this configuration, the 4000 works fine with all initiators (mostly esxi 4.1 dell servers with 1Gb Ethernet connections to the 6224's bcm5709 or intel 82576's). All the settings can be done manually - there isn't anything magical this command does. All enabling iscsi on these switches does according to the docs is enable flow control, enable jumbo frames, storm control, and enable some of the LLDP stuff so the SAN knows what switch port its on and can inform the switch better of a controller fail over. They have iscsi enabled and no VLANs other than any defaults. Both members run fw 6.0.5 and are connected to dedicated SAN network using 6224 switches stacked with stacking cable. In your case, turn the iSCSI stuff off on those switches and see if that changes anything. Personally, I don't like 5500 or 6200 series, in fact, we've pulled many of them out and replaced them with 5400s or Juniper/Cisco switches. 5500s were sold at first but once they bought Force10, all of sudden 5500s were no longer supported and only bare minimum switch to be sold with EQL was 6200 series. They's sold 5400 with Equallogic in the past and they work great. From what I can tell online, seems they sold the 5500 series switches with equallogic in mind at one point and then just dropped it altogether. I find it strange that the user guide for the 5500 series switches even mentions Equallogic and enabling iscsi. I was then informed that the PowerConnect 5500 series switches were not supported. Dell finally responded to me a few ours later via email and they could not find any problems on the switch or Equallogic. After fumbling around, I ended up trying a patch cable directly to my laptop and there were no packet errors whatsoever. I called dell and after 2 hours on support with 2 engineers, they took logs from the Equallogic and the switch.
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