NFS: 'Permission denied' for attributes after file move
This document (000020367) is provided subject to the disclaimer at the end of this document.
A SLES machine acting as an NFS client to a 3rd party NFS Server was upgraded from SUSE Linux Enterprise Server 12 SP4 to SP5. Then, on an NFS Mount, if a file is moved to a new location, subsequent directory listings give 'Permission denied' and display question marks instead of file attributes.
ls: cannot access 'subfolder/a.txt': Permission denied total 16 drwxr-xr-x 2 root root 8192 Apr 1 2021 ./ drwxr-xr-x 4 root root 8192 Apr 1 2021 ../ ?????????? ? ? ? ? ? a.txt
Until the NFS Server side can be corrected, possible workarounds include:
1. At the NFS client, when mounting the share, include the "lookupcache=none' option. This should avoid the problem altogether, although there could be a small performance penalty.
An example in a mount command:
mount -o lookupcache=none nfs-server1:/share1 /mnt
An example for /etc/fstab:
nfs-server1:/share1 /mnt nfs lookupcache=none 0 0
If #1 cannot be immediately implemented, alternatives 2 and 3 can be considered:
2. It is likely that touching (setting a new time stamp) on the parent directory will cause the NFS client to flush enough cache to correct the problem. If the problematic file is:
3. Dropping all disk caches at the NFS client machine will allow the client to learn new file handles, anywhere this problem has occurred. However, this step can have a large impact and should only be used as a last resort. Machine performance may suffer for a period of time after this is executed, because previously cached information from any/all file systems will have to be relearned from disk and/or from the NFS Server.
echo 3 > /proc/sys/vm/drop_caches
The NFS Server in this case was using 3PAR/File Persona Version 1.6.0, and the behavior was fixed by upgrading to 1.6.1.
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- Document ID:000020367
- Creation Date: 25-Aug-2021
- Modified Date:21-Sep-2021
- SUSE Linux Enterprise Server
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