Hi, same problem here: Wheezy Linux 3.2.0-4-amd64 #1 SMP Debian 3.2.68-1+deb7u3 x86_64 GNU/Linux running NFSv4 against a NetApp FAS2240 (ONTAP 8.2.3P2 7-Mode)
Multiple diskless NFS rooted systems reporting that warning: infra03-a/syslog:Aug 27 14:22:16 infra03-a kernel: [164600.492851] NFSv4 callback reply buffer overflowed! jira01/syslog:Aug 26 09:54:14 jira01 kernel: [64595.755284] NFSv4 callback reply buffer overflowed! nodejs01/syslog:Aug 26 21:11:32 nodejs01 kernel: [104524.818241] NFSv4 callback reply buffer overflowed! NFS config of NetApp system: nfs.v4.acl.enable off (value might be overwritten in takeover) nfs.v4.enable on (value might be overwritten in takeover) nfs.v4.id.allow_numerics on nfs.v4.id.domain nfs.v4.read_delegation on (value might be overwritten in takeover) nfs.v4.write_delegation off (value might be overwritten in takeover) Mount option NFSv4 of client: rw,noatime,nodiratime,vers=4,rsize=65536,wsize=65536,namlen=255,hard,nocto,proto=tcp,port=0,timeo=100,retrans=360,sec=sys ,minorversion=0,local_lock=none Best regards Rainer
