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Status Submitted
Workspace Storage Scale (formerly known as GPFS)
Created by Guest
Created on Dec 18, 2025

RELATED IDEAS

Add samlogon cache expiry and add support for manage_gids=yes and to re-authenticate AD users in NFS with sec=sys

The MANAGE_GIDS_EXPIRATION parameter is a configuration option within the NFS Ganesha core configuration file that controls the cache validity duration for group membership information (GID) lookups. 

The netsamlogon_cache.tdb file in Samba stores cached user and group information (e.g., SIDs and group memberships) retrieved from the Active Directory (AD) domain controller.
Running /usr/lpp/mmfs/bin/tdbtool /var/lib/gpfs-samba/netsamlogon_cache.tdb erase clears this cache, forcing Samba to requery AD for fresh data on the next user or group resolution request.

However, this cache does not automatically update unless specific actions trigger it, such as:
• Running wbinfo -a domain\\username to authenticate a user.
• Requesting a Kerberos ticket for a user.
• Performing NTLM authentication.

In environments using NFS with sec=sys (security flavor sys), user and group resolution relies on winbind, which queries AD via LDAP and caches the results in netsamlogon_cache.tdb. These queries are subject to the winbind cache timeout (default: 300 seconds). Since sec=sys does not involve Kerberos or NTLM authentication, the cache may not refresh automatically, potentially leading to stale group membership data if AD changes occur (e.g., a user is added to or removed from a group).

Idea priority Urgent

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