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Operating Systems AIX NFS mount from windows NAS with NFS server, have hidden folder on UNIX Post 303046112 by hicksd8 on Friday 24th of April 2020 04:32:52 AM
Old 04-24-2020
Let me say firstly that I am not an AIX expert. So what I am posting here now is just a generic Unix world response.

What have you tried already? You may already have tried this, but..................

NFS comes in 3 different currently available versions; version 2, 3 or 4.

Do you know which version the Windows hosted NFS for Unix is talking??

From the symptoms you are posting it seems likely that your issue is security based and the main differences between version 2, 3 and 4 are security performance/features.

Therefore, you need to know that each end of the NFS is talking the same language.

If you don't know the version that the Windows end is talking then no harm in trying your mount command with

Code:
-o vers=2
-o vers=3
-o vers=4

included on the command line (see your mount man page) to explore whether (a) it's the same, (b) it doesn't work at all, or (c) it fixes the issue.

There are other things we can consider but this is the first thing to try if you haven't already.

Last edited by hicksd8; 04-24-2020 at 08:21 AM..
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nfs(7)							 Miscellaneous Information Manual						    nfs(7)

NAME
nfs, NFS - network file system DESCRIPTION
The Network File System (NFS) allows a client node to perform transparent file access over the network. By using NFS, a client node oper- ates on files residing on a variety of servers and server architectures, and across a variety of operating systems. File access calls on the client (such as read requests) are converted to NFS protocol requests and sent to the server system over the network. The server receives the request, performs the actual file system operation, and sends a response back to the client. NFS operates in a stateless manner using remote procedure calls (RPC) built on top of an external data representation (XDR) protocol. The RPC protocol enables version and authentication parameters to be exchanged for security over the network. A server grants access to a specific file system to clients by adding an entry for that file system to the server's file. A client gains access to that file system using the command to request a file handle for the file system (see mount(1M)). (A file handle is the means by which NFS identifies remote files.) Once a client mounts the file system, the server issues a file handle to the client for each file (or directory) the client accesses. If the file is removed on the server side, the file handle becomes stale (dissociated with a known file), and the server returns an error with set to A server can also be a client with respect to file systems it has mounted over the network; however, its clients cannot directly access those file systems. If a client attempts to mount a file system for which the server is an NFS client, the server returns with set to The client must mount the file system directly from the server on which the file system resides. The user ID and group ID mappings must be the same between client and server. However, the server maps UID 0 (the superuser) to UID -2 before performing access checks for a client. This process prevents gaining superuser privileges on remote file systems. RETURN VALUE
Generally, physical disk I/O errors detected at the server are returned to the client for action. If the server is down or inaccessible, the client receives the message: where is the hostname of the NFS server. The client continues resending the request until it receives an acknowledgement from the server. Therefore, the server can crash or power down, and come back up without any special action required by the client. The client process requesting the I/O will block, but remains sensitive to signals (unless mounted with the option) until the server recovers. However, if mounted with the option, the client process returns an error instead of waiting indefinitely. AUTHOR
was developed by Sun Microsystems, Inc. SEE ALSO
exportfs(1M), share(1M), mount(1M), mount_nfs(1M), nfsd(1M), mount(2), fstab(4), dfstab(4). nfs(7)

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