[lustre-discuss] lustre file system errors with large user UIDs

Cowe, Malcolm J malcolm.j.cowe at intel.com
Mon Jun 26 01:26:06 PDT 2017

One of the most common causes of permissions problems on Lustre is not propagating UIDs and GIDs onto the MDS. The servers that run the MDTs for the file system need to be able to look up the UIDs and GIDs of the users that can access the file system.

The symptoms you describe do match this scenario. I can reproduce this behaviour with both “high” (600000) and “low” (2000) UID numbers, and adding the UIDs/GIDs to the MDS fixes the issue on my testbed.

Malcolm Cowe
High Performance Data Division

Intel Corporation | www.intel.com

From: lustre-discuss <lustre-discuss-bounces at lists.lustre.org> on behalf of "John S. Urban" <urbanjost at comcast.net>
Date: Monday, 26 June 2017 at 1:45 am
To: Lustre discussion <lustre-discuss at lists.lustre.org>
Subject: [lustre-discuss] lustre file system errors with large user UIDs

We recently added a lustre file server.  All appears to be going well except when users with a UID >  2**19  (ie. 524 288,) try to access the file
System; although no similar problems appear mounting other types of file systems (we have many others).  So the problem appears to be
Specific to the lustre mounts.  Users with the large UIDs get  “permission denied” if they try to access the file system, and commands like ls(1)
Show question marks for most fields (permission, owner, group, …).  Is there a non-default mount option required to use lustre with large UID

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