I have two ESX servers (running on v5 Server Essentials) that have plenty of available RAM & PROC, but are running very low on disk. All of the disk is local storage and there are no available drive bays to add additional storage. Unfortunately cost is an issue here as well. What are some cost efficient ways to add more disk to be accessed by the servers? I know that a SAN could be implemented, but I'm looking for a cheaper alternative.
Is there a way to add external storage to the servers or an appliance that would allow me to create NFS datastores and connect to them over the Gb network?
Thanks in advance for your expert advice!