# NAS with NFS

When NAS hardware uses NFS as its file system, it is particularly difficult to determine whether the solution meets the criteria. Our research indicates the following conclusions:

- NFS v2 and NFS v3 definitely do not satisfy the criteria.
- NFS v4 with TCP might satisfy the criteria. Consult with the NAS vendor to verify that the NFS server (in the NAS) satisfies the criteria. Consult with the operating system vendor to verify that the NFS client (in the OS on the server host computer) satisfies the criteria. When both vendors certify that their components cooperate to guarantee the criteria, then the shared storage solution supports EMS.

For more information on how the EMS locks shared store files, see Managing Access to Shared Store Files.

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