Good morning, I have an intermittent problem that I can not solve and today I ask for your help because I have no more idea. I have two Apache/PHP web servers (the clients) that use GlusterFS volumes via NFS (NFS-Ganesha) as data disks. The problem is that sometimes files saved to the server via PHP applications are not visible. Sometimes it's one of the two clients who doesn't see them, other times it's both clients. It's random because in general, everything works well. When I realize that a file is in trouble, I go to the directory “cd /data/folder” and I do an “ls -l”. I have no warnings or errors in the log files (clients and servers) Do you have any ideas or ways to help me solve this problem? Here's some informations. Let me know if you need anything else to help me. Thank you so much Versions: Linux: Debian 10 (clients and servers) NFS-Ganesha: 4.0 GlusterFS: 10.4 Mount Clients: 192.168.11.90:/prod_web on /data type nfs4 (rw,noatime,nodiratime,vers=4.2,rsize=1048576,wsize=1048576,namlen=255,hard,proto=tcp,timeo=600,retrans=2,sec=sys,clientaddr=192.168.11.150,local_lock=none,addr=192.168.11.90) Mount volume GlusterFS: /dev/mapper/vg3-prod_web on /data/glusterfs/prod_web/brick1 type xfs (rw,noatime,nouuid,attr2,inode64,noquota) Ganesha.conf: NFS_CORE_PARAM { NFS_Protocols = 4; # Pour éliminer l'erreur: Cannot bind RQUOTA udp6 socket, error (Address already in use) Enable_RQUOTA = false; RQUOTA_Port = 0; } NFS_KRB5 { Active_krb5 = false; } # You don't want grace to be less than lease, if it is, clients may not detect # server crash in time to reclaim lost locks during grace period. NFSV4 { Lease_Lifetime = 15; Grace_Period = 15; } LOG { ## Default log level for all components Default_Log_Level = WARN; } EXPORT { Export_Id = 3; Path = "/prod_web"; Pseudo = "/prod_web"; Access_Type = RW; Squash = No_root_squash; Disable_ACL = true; Protocols = "4"; Transports = "UDP","TCP"; SecType = "sys"; FSAL { Name = "GLUSTER"; Hostname = localhost; Volume = "prod_web"; } } Gluster Volume Info: Volume Name: prod_web Type: Replicate Volume ID: e918bd26-3318-48b3-8902-1a3b1de4f0f3 Status: Started Snapshot Count: 0 Number of Bricks: 1 x 3 = 3 Transport-type: tcp Bricks: Brick1: gluster1.fsaa.local:/data/glusterfs/prod_web/brick1/brick Brick2: gluster2.fsaa.local:/data/glusterfs/prod_web/brick1/brick Brick3: gluster3.fsaa.local:/data/glusterfs/prod_web/brick1/brick Options Reconfigured: storage.build-pgfid: on diagnostics.brick-log-level: WARNING performance.client-io-threads: on nfs.disable: on transport.address-family: inet performance.cache-size: 1GB performance.parallel-readdir: off performance.read-ahead: off cluster.readdir-optimize: on client.event-threads: 4 server.event-threads: 4 features.cache-invalidation: on features.cache-invalidation-timeout: 600 performance.cache-invalidation: on performance.md-cache-timeout: 600 network.inode-lru-limit: 150000 auth.allow: 192.168.11.150,192.168.11.151,192.168.11.40 performance.nl-cache: on performance.nl-cache-timeout: 600 diagnostics.client-log-level: WARNING cluster.server-quorum-type: none cluster.enable-shared-storage: enable Renaud Fortier Administrateur RI Services communs des ressources informatiques, pédagogiques et technologiques (SCRIPT, FSAA, FFGG, SSE) Université Laval T  418 656-2131, poste 404789 Clavardons sur Microsoft Teams<https://teams.microsoft.com/l/chat/0/0?users=REFOR103@ulaval.ca> Pavillon Paul-Comtois, local 3100-C Québec (Québec) G1V 0A6 Avis relatif à la confidentialité<https://www.ulaval.ca/notre-universite/avis-de-confidentialite.html>