Acquire runs autonomously on the host system. All communication between Acquire and the Syncsort™ Capacity Management Control Center is via file transfer (the protocol used can be FTP or Secure FTP). File transfer is initiated with the Syncsort Capacity Management Control Center acting as the client end and the VMS system acting as the server end of the conversation.
The Control Center controls data capture by downloading a file called APMCONFG.TXT to the node specific configuration directory of the METRON_DC user. This is a text file, a sample of which is listed later. The APM_MANAGER job processes this file and controls the creation of data by using batch jobs in the APM_DC_<nodename> queue, and also manages the housekeeping of data, all based on the instructions in APMCONFG.TXT.
All the data captured by Acquire is written periodically to a set of files in the directory described by the logical name APMDATA.
The capture of performance data by Acquire is carried out as follows:
Data on CPU performance, disk operation rates and disk queue lengths is captured using the standard VMS MONITOR command
Data on processes is captured using the GETJPIW system service
Data on disk free space is captured using the GETDVI system service
Other system data is captured using the GETSYI system service