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I guess something else to consider is extra space for snapshots. Would need quite a bit of space to snapshot a 1TB worth of file server:)
Yes the main reason to reserve some free disk space, is for snapshots. The size of the snapshots depend on the changes made while the snapshot exists. As a best practice, a snapshot should only exist as long as necessary, e.g. for risky software updates and/or image based backups. A snapshot (delta file) starts with only a few MB in size and grows depending on the changes. If you don't need all the 1.6TB for the file server right now, I'd recommend you leave >=20% free. Depending on the OS you plan to use, it should be easy to grow the virtual disk when needed.
Also, do you recommend a round robin managed path for this datastore?
If RR is supported by the storage vender, then go for it.
André
PS: For how snapshots work in ESXi, see http://kb.vmware.com/kb/1015180