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Virtual machines might experience slow performance in vSAN 6.5 while running certain NVMe drivers

  Symptoms

  •  In rare occasions, under high input/output processing conditions you may observe the vSAN disk group going offline.
  • In the /var/log/vmkernel file, you see message similar to:
2020-03-30T15:48:43.044Z cpu7:21644947)nvme:scsiIoCompleteCommand:459:vmkCmd 0x43a194105f00[28h I:0x4307df218480 SN:0x168418e0] UNDERRUN 8192/32768

Note: The preceding log excerpts are only examples. Date, time, and environmental variables may vary depending on your environment.
Cause

This issue is caused in the inbox driver.

Note:This is only observed when using the following NVMe devices in vSAN cluster:

  • Intel NVMe P4800X
  • Intel NVMe P4600/P4500
  • Intel NVMe P4610/ P4510 
Resolution
This issue is resolved in VMware ESXi 6.5 EP20 Patch Release ESXi650-202006001, available at VMware Patch Downloads.
For more information on downloading patch, see How to download patches in MyVMWare (1021623).

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