[HPDD-discuss] What is opc and its significance ?

Hello, In logs, generally messages of the form, like below are seen, 00000100:00100000:2.0:1307742632.935994:0:23114:0:(service.c:1705:ptlrpc_server_handle_reque st()) Handling RPC *pname:cluuid+ref:pid:xid:nid:opc* ll_ost_io_126:30dc3ffd-9567-deb3-c9ed-423e4589e173+6:21865:x1371266995979156:12345-0@lo :*10 * 00000100:00100000:2.0:1307742632.950439:0:23114:0:(service.c:1752:ptlrpc_server_handle_reque st()) *Handled RPC pname:cluuid+ref:pid:xid:nid:opc* ll_ost_io_126:30dc3ffd-9567-deb3-c9ed-423e4589e173+6:21865:x1371266995979156:12345-0@lo :*10* What are these values ? what do they signify ? Are there any standard definitions for these ? from lustre/include/lustre/lustre_idl.h 991 struct ptlrpc_body { 992 struct lustre_handle pb_handle; 993 __u32 pb_type; 994 __u32 pb_version; *995 __u32 pb_opc*; 996 __u32 pb_status; 997 __u64 pb_last_xid; 998 __u64 pb_last_seen; 999 __u64 pb_last_committed; 1000 __u64 pb_transno; 1001 __u32 pb_flags; 1002 __u32 pb_op_flags; 1003 __u32 pb_conn_cnt; 1004 __u32 pb_timeout; /* for req, the deadline, for rep, the service est */ 1005 __u32 pb_service_time; /* for rep, actual service time, also used for 1006 net_latency of req */ 1007 __u32 pb_limit; 1008 __u64 pb_slv; 1009 /* VBR: pre-versions */ 1010 __u64 pb_pre_versions[PTLRPC_NUM_VERSIONS]; 1011 /* padding for future needs */ 1012 __u64 pb_padding[4]; 1013 }; Thanks -- cheers Akam