We may not be able to see the Files and folders on vSAN datastore when one or more vSAN cluster nodes experience Memory congestion.

VMs failed to power on on vSAN cluster with Input/Output error

vmkernel.log:

============

LSOM: LSOM_ThrowCongestionVOB:3429: Throttled: Virtual SAN node esxi5 maximum Memory congestion reached.

LSOM: LSOM_ThrowCongestionVOB:3429: Throttled: Virtual SAN node esxi5 maximum Memory congestion reached.

============

This is observed when we have memory congestion on vSAN hosts.

To Resolve this issue:

We will have to identify the HOST with memory congestion. Put it in maintenance with ensure accessibility if possible. If not, put it in maintenance mode with “noAction” and reboot the host