1. DNS vs. IP
DNS is more flexible until your internal DNS goes out. Therefore I tend to do IPs.
2. You need a management network.
If you have more than one network, to do iSCSI or NFS, you have to setup a management console (VMkernel) on each network to attach storage.
Otherwise you will get the error:
"Unable to Mount filesystem: Unable to connect to NFS server."
When setting up the VMkernel, don't update the default gateway for the secondary network. Leave it the primary network.
3. Verify your NAS share is really what you think it is.
Example: For ReadyNAS, you may set a share called "backup", however it might really be /c/backup or c/vols/backup, etc. Include the leading slash.
Use a Linux workstation to verify what the share path REALLY if the share name is reported as invalid.
4. Root Squash / Hosts Allow
Don't forget to include the vmware servers in the hosts allow for root access and undo the root squash for them. Include the VC.
5. Writeback/cached writes.
I don't like cached writes even though it makes the NAS faster for updates. Instead, I always disable this. In some NAS GUIs this is called "Sync" mode to disabled write caching.
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