TRANSFER Installation and Management Guide

File Descriptions
The TRANSFER Environment
068837, Update 1 to 013198 Tandem Computers Incorporated 2–11
Session File
The Session (SESSION) file contains information about correspondents who have
sessions currently in progress at your node. A unique session ID is associated with
each active session. TRANSFER adds a record to this file when a correspondent starts
a session and deletes that record when the session is terminated. During a session,
every incoming interprocess communication (IPC) header is validated against the
Session file. TRANSFER checks the Session file periodically for idle sessions that
should be terminated.
“Partitioning the Session File” in Section 12, “Troubleshooting,” explains how to
partition the Session file.
Scheduler Files
The Ready (READY), Time (TIME), and Net (NET) files contain entries for work that
TRANSFER does not need to perform immediately in order to satisfy requests. These
entries include packages that have been submitted for delivery, packages that have
been canceled, items to be deleted, sessions to be ended, and translation requests.
These files are used by the TRANSFER scheduler. After any failure that requires TMF
recovery, the TSRBLD program must be run to regenerate the entries in these files; the
TSRBLD program is described in Section 11.
System Monitoring Files
The TRANSFER Sampler server (TSAMPLE) is an asynchronous process that takes
samples of both the TRANSFER database and the TRANSFER scheduler queues. The
data collected by TSAMPLE is stored in two database files:
The Data Base Sample file (DBSAMPL) contains database sample records collected
by the TSAMPLE server.
The Queue Sample file (QSAMPL) contains scheduler queue sample records
collected by the TSAMPLE server.
Statistics File
The depot statistics facility both collects current statistics and keeps a record of these
statistics over time. These statistics are stored in the DEPSTAT file.
If you are collecting statistics and change any statistics configuration parameters, the
samples you have collected are backed up to another file called the DEPSTATO file the
next time you run the XCOOL program.
Section 9 of this manual explains the depot statistics facility.