Hi,
Can you get me esxtop output from esxi host using this command
Using SSH to ESXi host
esxtop
then hit key 'd' . note down DAVG value , KAVG, and GAVG. , if this value is high, then storage vendor need to investigate.
Also you can refer this KB VMware KB: Using esxtop to identify storage performance issues for ESX / ESXi (multiple versions)
Regards
Mohammed