I am currently just using NFS shares, but have found the use for accessing some of my shares from windows aswell. So question is, can I share the same dir as both a NFS share and Samba share?

Also I am using shared groups between the file server and clients to control permissions for the NFS share now. How do I manage the permissions when sharing with samba? is it enough to have the same group name in AD and delegate access with that?

That is the only "safe" use case. If you are the only one that will ever use it and you won't ever access the same file from both at the same time you are fine. But then you can ask another question.. "Why bother?"

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It is OK to share using CIFS, NFS, whatnot, simultanously. Linux does not care how many users open a file and which protocol they are using.

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The users may care if there is non-arbitrated updates from disparate systems. That's why cluster aware filesystems exist.

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Thanks for the replys!

a cluster filesystem means a filesystem that can be accessed and modified at the same time at block lvl? I have just recently made the change to ZFS, not sure if that is cluster aware or not. But sharing the same path with both NFS and Samba should only be a problem if 2 or more clients are trying to modify the exact same file at the same time?

The reason I want to keep the NFS shares is becaus I feel like it is faster, is this correct?

When it comes to permissions. do I have to make samba users on the linux fileserver with the same name/groupname as the ones used to share NFS to be able to share to both? This is my first time sharing using Samba.. only used it to test out AD functionality until now