Virtual Machines Hang or Experience Poor Performance on vSAN ESA During Large Amount of Unmap Activity
Article ID: 388241
Updated On:
Products
Issue/Introduction
After issuing TRIM or Unmap operations from a guest operating system virtual machines on the same ESXi host experience hanging, lockup, extreme latency, or other undesired impact. THis is often, but not always seen with a sudden increase in CPU utilization for the host the guest is running on.
Risks:
This may result in impact to production operations as the guests cannot operate or may crash.
Environment
VMware vSAN ESA 8.x & 9.x
Cause
The vSAN ESA unmap process may result in CPU contention on the host running the VM that issued the unmap I/O.
Resolution
Broadcom recommends upgrading to the latest version of 8.x or 9.x, depending on the version currently in use for your environment, for improved performance. If you're still seeing slow performance after upgrading collect complete cluster logs during the time of the event, open a case with vSAN Support, and upload the logs for further investigation.
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