Administrator Guide

NFS Access Denied to a File or Directory
Description A client cannot access the NFS le or directory despite the fact that the user belongs to the group
owning the NFS object and the group members are permitted to perform the operation.
Cause NFS servers (versions 2 and 3) use the Remote Procedure Call (RPC) protocol for authentication of NFS
clients. Most RPC clients have a limitation, by design, of up to 16 groups passed to the NFS server. If a
user belongs to more than 16 UNIX groups, as supported by some UNIX types, some of the groups are
not passed and are not checked by the NFS server and therefore the client's access might be denied.
Workaround A possible way to verify this problem is to use newgrp to temporarily change the primary group of the
user and thus ensure it is passed to the server.
The simple workaround, although not always feasible, is to remove the user from unnecessary groups,
leaving only 16 groups or less.
Troubleshoot NAS File Access and Permissions Issues
This section contains probable causes of and solutions to common NAS le access and permissions problems.
Cannot Change the Ownership of a File or a Folder
Description Every le on the FluidFS cluster is owned by either a UNIX or NTFS user. Inability to change ownership is
treated dierently, depending on whether the access is native or non-native.
Cause The user is not authorized to perform the ownership change.
Workaround An authorized user must perform this action.
Cannot Modify NAS Files
Description
A user or an application cannot modify a le.
Cause
• The client cannot modify a le due to lack of permissions on the le.
• The NAS volume has reached full capacity and the le system denies any write requests, including
overwrites.
• The NAS volume is a target in a replication and is read-only.
Workaround
1. If the problem appears only on some les, this is a permission issue. Verify that the user account has
modify permissions on the le or use a dierent user account.
2. If the problem is related to a specic NAS volume, verify there is enough free space on the NAS
volume or expand it, and verify that the accessed NAS volume is not a target of a replication.
Mixed File Ownership Denied
Description
Both the le owner and group owner must be from the same identity type (UNIX vs. NTFS). An attempt
to set dierent identity types was detected.
Cause It is impossible to change only the le owner ID to UID if the original le ownership is SID/GSID.
Workaround To change the le ownership to UNIX style ownership, set UID and GID at same time.
Problematic SMB Access From a UNIX/Linux Client
Description
A UNIX/Linux client is trying to mount a FluidFS cluster SMB share using SMB (using /etc/fstab or
directly using smbmount).
Cause A UNIX/Linux client is trying to access the le system using the smbclient command, for example:
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FluidFS Troubleshooting