ESXi no longer automatically loads this module.
Results in this:
You are unable to power on some virtual machines
Powering on virtual machines fail with the error:
File [VMFS volume] VM-name/VM-name.vmdk was not found.
When you view the details of this message, you see entries similar to:
Error Stack:
An error was received from the ESX host while powering on VM VM-name
Cannot open the disk '/vmfs/volumes/Datastore/VM-name/VM-name.vmdk' or one of the snapshot disks it depends on.
The system cannot find the file specified.
VMware ESX cannot find the virtual disk '/vmfs/volumes/Datastore/VM-name/VM-name.vmdk'. Verify the path is valid and try again.
solution:
log in to your esx server and run this command:
vmkload_mod multiextent