Hello,
As always this depends. You did not state the VMware Product you are using nor the type of NAS you are using or the type of VMs that will be running. But yes, a NAS and a SAN can be used together. If you are using VMware ESX, the only NAS devices currently supported as Datastores for VMs are iSCSI and NFS over TCP based NAS devices. If you have any other then you would need to use it as a fileshare for each individual VM and not as a VM data store.
A VM datastore is where the Virtual disks and configuration files Live.
Which VMware product are we discussing, and can you give us specifics about your NAS and perhaps your VMs? THis will help determine how to use the devices together.
Best regards,
Edward L. Haletky
VMware Communities User Moderator
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Author of the book 'VMWare ESX Server in the Enterprise: Planning and Securing Virtualization Servers', Copyright 2008 Pearson Education. CIO Virtualization Blog: http://www.cio.com/blog/index/topic/168354
As well as the Virtualization Wiki at http://www.astroarch.com/wiki/index.php/Virtualization
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Edward L. Haletky
vExpert XIV: 2009-2023,
VMTN Community Moderator
vSphere Upgrade Saga: https://www.astroarch.com/blogs
GitHub Repo: https://github.com/Texiwill