Here is a good method to have a central location for all your ISO files in your ESX environment. You could put them on say your Virtual Center server if it’s physical:

From the ESX host:

mount -t smbfs -o username= //windows server/share /vmimages/ISO” you can also use a windows domain username by typing “username=,workgroup=”
You will be prompted for a password for the user account you are using.

You’ll need these ports opened between the host and where your storage location is: TCP ports 137 139 and 445.

More information here:

http://communities.vmware.com/message/617350#617350

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