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ESXi 6.5 iscsi MultiPathing with QNAP Active-RR Severe Latency??

I'm trying to multi-path using a QNAP 453a NAS and software ISCSI. I've previously been able to set things up, trunk ports on the QNAP nics with Active-RR, and build from there. I'm using power-CLI to create the active-unused port group nic policies, since the options are limited in the 6.5 web gui.  Whenever I try to configure the QNAP to active-rr, my ability to scan the device and detect storage becomes an exercise in watching paint dry: painful latency!

Has anyone had similar issues with iscsi multi-pathing in 6.5 using a round robin configuration with a NAS?

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