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SMF Type 31 Record

This table shows the record layout for type 31 SMF records
(TIOC Initialization).

List of other SMF record layouts available.
List of sample SMF reports.

Purpose: Record type 31 is written when a MODIFY TCAM operator command is issued. This record contains the number of time-sharing buffers, buffer size, maximum number of output and input buffers allowed per terminal before OWAIT or LWAIT, OWAIT and RESTART thresholds, number of buffers reserved on the free queue, and the size of one terminal status block. OWAIT is the suspension of the program during input/output processing to the terminal because no output buffers are available. LWAIT is the locking of the terminal’s keyboard because the terminal user filled all of the available input buffers.

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SMF Type 31 Record -- TIOC Initialization
Offset
(Dec.)
Offset
(Hex)
NameLengthFormatDescription
00SMF31_
TTI31LEN
2binary
Record length. This field and the next field (total of four bytes) form the RDW (record descriptor word). See “Standard SMF Record Header” on page 13-1 for a detailed description.
22SMF31_
TTI31SEG
2binary
Segment descriptor (see record length field).
44SMF31_
TTIRFLG
1binary
System indicator: Bit Meaning When Set 0-2 Reserved 3-6 Version indicators* 7 Reserved.*See “Standard SMF Record Header” on page 13-1 for a detailed description.
55SMF31_
TTIRCDTY
1binary
Record type 31 (X'1F').
66SMF31_
TTIRCDTS
4binary
Time since midnight, in hundredths of a second, that the record was moved into the SMF buffer.
10ASMF31_
TTIRCDTE
4packed
Date when the record was moved into the SMF buffer, in the form 0cyydddF. See “Standard SMF Record Header” on page 13-1 for a detailed description.
14ESMF31_
TTICPUID
4EBCDIC
System identification (from the SID parameter).
1812SMF31_
TTINBF
2binary
Number of time-sharing buffers.
2014SMF31_
TTIBUFSE
2binary
Time-sharing buffer size, in bytes.
2216SMF31_
TTIRSVRD
2--
Reserved.
2418SMF31_
TTIOMAX
2binary
Maximum number of output buffers allowed per terminal before OWAIT.
261ASMF31_
TTIIMAX
2binary
Maximum number of input buffers allowed per terminal before LWAIT.
281CSMF31_
TTIOWTH
2binary
OWAIT threshold. The number of buffers that must be freed in order to be freed from OWAIT.
301ESMF31_
TTIRSTH
2binary
RESTART threshold. The number of buffers that must be freed in order to be freed from LWAIT.
3220SMF31_
TTIUSLW
2binary
Number of buffers reserved on the free queue (less than this number results in a system-wide LWAIT).
3422SMF31_
TTIUSSL
2--
Reserved.
3624SMF31_
TTITSBS
1binary
Size of one terminal status block (TSB).
3725SMF31_
TTIUSCH
21Reserved.

The table above is based on the description provided by IBM in its "MVS Systems Management Facilities (SMF)" manual.

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