0000883: Support of large records in VS/VBS datasets on z/OS

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Date Submitted

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0000883

FL5

2.2 Subprogram FLUC (CONV)

public

2017-07-05 09:04

2017-07-10 09:47

Reporter

Falk Reichbott

Assigned To

Falk Reichbott

Priority

normal

Severity

feature

Reproducibility

N/A

Status

resolved

Resolution

not fixable

Platform

System z

z/OS

OS Version

V2R20

Product Version

5.1.15

Target Version

5.1.16

Fixed in Version

5.1.16

Summary

0000883: Support of large records in VS/VBS datasets on z/OS

Description

Currently the record length of variable length host datasets can not exceed the LRECL-4. Means VS/VBS works for block sizes smaller then LRECL, for a first record segment at the end of the Block and a last segment at beginning of the next block, but not if total record length (first, n*middile, last) exceeds the defined logical record length.

To support large records, the check of the record length for VS/VBS must be disabled and the record buffer must be increased. The size of the record buffer must be choosable. For this a multiple of the record length can be defined. A good default will be 16, if no value given.

Means by default a VS/VBS file can hold records 16 time largner then LRECL-4. For example a SMF-Dump can hold up to 512k long records. If more required the user can increase the faktor. A faktor of 1 result in the old behavior.

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Notes
(0001109) Falk Reichbott (administrator) 2017-07-05 14:40	With version 5.1.16 of FLAM large records up to 256kib are supported if VBS or VS used. The implemented rule supports fix 8*(LRECL-4) if a VBS or VS data set is used.

(0001110) Falk Reichbott (administrator) 2017-07-05 14:47	The dynamisation of records length for ANSI extended logical records and VS/VBS is still open and will be fixed in one of the next revisions.

(0001111) Falk Reichbott (administrator) 2017-07-10 09:46	A large record support is currently not supported with LE access methods. A own implemenmtation over BSAM lcoate would be possible but realy expensive. Based on that we have only extent the VS/VBS support to exceed the LRECL up to 64kB, but the limit of the LE is 32k. Means no longer records can occur.

Issue History
Date Modified	Username	Field	Change
2017-07-05 09:04	Falk Reichbott	New Issue
2017-07-05 09:04	Falk Reichbott	Status	new => assigned
2017-07-05 09:04	Falk Reichbott	Assigned To	=> Falk Reichbott
2017-07-05 14:40	Falk Reichbott	Note Added: 0001109
2017-07-05 14:47	Falk Reichbott	Note Added: 0001110
2017-07-10 09:46	Falk Reichbott	Note Added: 0001111
2017-07-10 09:46	Falk Reichbott	Status	assigned => resolved
2017-07-10 09:46	Falk Reichbott	Fixed in Version	=> 5.1.16
2017-07-10 09:46	Falk Reichbott	Resolution	open => fixed
2017-07-10 09:47	Falk Reichbott	Resolution	fixed => not fixable