Some of the VM’s are not accessible and some are very slow after investigating everything it’s a SAN issue data store is locked so LUN reset performed to clear lock to a SAN/ LUN
Issue got resolved after rest LUN.
Now I want to know why the data store/LUN locked automatically
you might want to check if a host got isolated recently from the network - HA sometimes tries endlessly to poweron the VMs elsewhere and the locks prevent it from doing so -- other causes is a very busy SAN array not finding CPU time to release the locks....the vmkernel log from the hosts should help ..also look for VC event for host isolation
can you please provide few more details - SAN array /model etc and also ESX version
esxi 4.1
San array model i will let you know
you might want to check if a host got isolated recently from the network - HA sometimes tries endlessly to poweron the VMs elsewhere and the locks prevent it from doing so -- other causes is a very busy SAN array not finding CPU time to release the locks....the vmkernel log from the hosts should help ..also look for VC event for host isolation
