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XS712T Jumbo Frames (Large Packet Size Failing) Vmware vSAN
I am running vmware 6.0 U2 vSAN dedicated traffic on a XS712T network switch and I am getting MTU Large Packet Size Fails on all ports. I am reading that there are issues with large packets on Netg...
After much testing and trial and error. We found that issue is that the XS712T was overheating and causing the issue. As it is rackmounted in the Dell rack and the way the fans in the unit blow air from side to side, it was not getting enough air flow.
When we took the unit and turned it side ways in the rack so that it blew our out the back of the rack, it ran much cooler and the errors stopped.
We also purched a secondardy XS712v2 as a failover and run it in the same way, exhaust running out the back and do not get any errors.
Feel that the orginial XS712T will produce errors when it overheats and was the source of our problems.
Again, this is a check that is going wrong. Discussed up and down https://communities.vmware.com/thread/538961 - no impact on the functionality.
After much testing and trial and error. We found that issue is that the XS712T was overheating and causing the issue. As it is rackmounted in the Dell rack and the way the fans in the unit blow air from side to side, it was not getting enough air flow.
When we took the unit and turned it side ways in the rack so that it blew our out the back of the rack, it ran much cooler and the errors stopped.
We also purched a secondardy XS712v2 as a failover and run it in the same way, exhaust running out the back and do not get any errors.
Feel that the orginial XS712T will produce errors when it overheats and was the source of our problems.
Reads like that's one of these very hot running racks with a lot of machines and storage below, probably in a very dense (pizza box on pizza box) stacking. Very often, the simple 1U network devices run into thermal issues as these are not designed for the common front2back airflow. Nothing that specific to the XS712T, experienced with other major switch or router devices over the years several times.
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