The server is running build: 2.5.59-g47cde80-CHANGED-2.6.32-431.17.1.el6_lustre.netboot, MDT is ldiskfs, OSTs are zfs. The filesystem mounts on a client running v1_8_9_WC1-g171bd56-CHANGED-2.6.32-431.17.1.el6.x86_64 We're not able to create directories from the client as root or user.. As root, it gives this message: mkdir: cannot create directory `test2': Unknown error 524 As a user, we're able to create files at the top level, but no directories: [kar@kollman2 kar]$ touch test2 [kar@kollman2 kar]$ mkdir test3 mkdir: cannot create directory `test3': Operation not permitted Filesystem Inodes IUsed IFree IUse% Mounted on 10.10.101.160@o2ib:/iconfs 39049920 273 39049647 1% /iconfs There were no errors during the kernel or lustre builds. Any ideas what the problem might be? Thanks in advance, -Anjana Kar Pittsburgh Supercomputing Center kar-YUCGctl3KYs@public.gmane.org