PRIMECLUSTER Global File Services Configuration and Administration Guide 4.1 (Linux)

2.2.3 Monitoring daemon

• sfcfrmd

  Receives a request from the sfcfsd command and provides the communication paths to enable execution of the sfcfsd and sfcprmd commands and inter-node communications. Configuration database management and the management partition I/O functions are also provided.

• sfcprmd

  Used to monitor the startup, stop, or failure of the processes that constitute the GFS Shared File System. When the configuration process starts or executes another daemon or command, a request is transmitted to sfcprmd, and then sfcprmd executes a daemon or a command as required.

  The process from which a request is transmitted is referred to as the client process, while the process to be started from sfcprmd as required is referred to as the target process.

  The target process is monitored by sfcprmd and, when the process terminates normally or abnormally, the status is posted to the client process.

• sfcfsd

  Provides MDS/AC control functions such as the GFS Shared File System operation start/stop, failover of MDS, online node addition/deletion, and failback (migration) to the definition state of the file system configuration.

• sfchnsd

  Used to provide functions such as node down event reception, and node state acquisition.

• sfcpncd

  Performs live monitoring of sfcprmd, sfcfrmd, or sfcclnd that is to be monitored. Used to instigate a panic in a node depending on the state (process down) of the process to be monitored.