Hello, a local account on a nfs client couldn’t write to a ganesha nfs export even with directory permissions 777. The solution was to create the account on the ganesha servers, too. Please can you confirm that this is the intended behaviour? is there an option to change this and to map unknown accounts to nobody instead? We often have embedded Linux appliances or similar as nfs clients which need to place some data on the nfs exports using uid/gid of local accounts. We manage gids on the server side and allow NFS v3 client access only. I crosspost this to ganesha support and to the gpfsug mailing list. Thank you, Heiner Billich ganesha version: 2.5.3-ibm028.00.el7.x86_64 the ganesha config CacheInode { fd_hwmark_percent=60; fd_lwmark_percent=20; fd_limit_percent=90; lru_run_interval=90; entries_hwmark=1500000; } NFS_Core_Param { clustered=TRUE; rpc_max_connections=10000; heartbeat_freq=0; mnt_port=33247; nb_worker=256; nfs_port=2049; nfs_protocols=3,4; nlm_port=33245; rquota_port=33246; rquota_port=33246; short_file_handle=FALSE; mount_path_pseudo=true; } GPFS { fsal_grace=FALSE; fsal_trace=TRUE; } NFSv4 { delegations=FALSE; domainname=virtual1.com; grace_period=60; lease_lifetime=60; } Export_Defaults { access_type=none; anonymous_gid=-2; anonymous_uid=-2; manage_gids=TRUE; nfs_commit=FALSE; privilegedport=FALSE; protocols=3,4; sectype=sys; squash=root_squash; transports=TCP; } one export # === START /**** id=206 nclients=3 === EXPORT { Attr_Expiration_Time=60; Delegations=none; Export_id=206; Filesystem_id=42.206; MaxOffsetRead=18446744073709551615; MaxOffsetWrite=18446744073709551615; MaxRead=1048576; MaxWrite=1048576; Path="/****"; PrefRead=1048576; PrefReaddir=1048576; PrefWrite=1048576; Pseudo="/****"; Tag="****"; UseCookieVerifier=false; FSAL { Name=GPFS; } CLIENT { # === ****/X12SA === Access_Type=RW; Anonymous_gid=-2; Anonymous_uid=-2; Clients=X.Y.A.B/24; Delegations=none; Manage_Gids=TRUE; NFS_Commit=FALSE; PrivilegedPort=FALSE; Protocols=3; SecType=SYS; Squash=Root; Transports=TCP; } …. -- Paul Scherrer Institut Heiner Billich System Engineer Scientific Computing Science IT / High Performance Computing WHGA/106 Forschungsstrasse 111 5232 Villigen PSI Switzerland Phone +41 56 310 36 02 heiner.billich@psi.ch<mailto:heiner.billich@psi.ch> https://www.psi.ch