connect NAS as datastore or use it as shared folder

which is better .connect NAS storage as a data-store inside vmware esxi and make the storage space looks like local disk inside the server for backup exec server .or connect the machine directly to the shared folder in NAS without applying this NAS as datastore inside esxi.
Thank you
hossameldein osmanAsked:
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
connect the machine directly to the shared folder in NAS without applying this NAS as datastore inside esxi.

If performance is important this option.

The more layers you add the worse the performance.
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nociSoftware EngineerCommented:
You will need to measure it...

is the double overhead on storage a performance bottleneck,  OR
is the double overhead on network layer a performance obstacle..

For NAS there is at least on layer of network, when connected as nas to the guest there are two network layers...
when provided as storage there are two storage layers....
Also you need to take into account the caching on the various places and their influence. So test need to account for that.
(If your production load is sustained, then you need to test a longer period so caches can be filled to representable levels).
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hossameldein osmanAuthor Commented:
Thank you all for your help.I connect the NAS storage directly with the VM.it is slower than the VM connect to the NAS via configuring the NAS as datastore.
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