Memorex LOCK - VERSION 2-24 Specifikace stáhnout pdf (Strana 81)

Quick DASD Allocation System (QDAS) Creating QDAS Share Files

Chapter 2. Installing the Basic System 2-53

Creating QDAS Share Files

The Share File allows QDAS to access and update its space usage map from multiple

machines. A Share File is required for each volume that has been defined to QDAS and is

accessed by more than one machine. TSIVCLR initializes the Share Files. Sample JCL can

be found in the BIM-EPIC installation sublibrary as TSIVCLR.Z.

The name of each Share File in a VTOC is volid.QDAS.RELx.SHARE.FILE where volid is

the volume serial number of the QDAS-controlled volume. The Share File is given an

expiration date of 2099/366 (permanent retention).

Initialize a Share File for each shared volume with the TSIVCLR utility, as shown below.

// DLBL TSIVFLE,'volid.REL4.SHARE.FILE'

// EXTENT SYSnnn,volid,1,0,n,1

// ASSGN SYSnnn,DISK,VOL=volid,SHR

// EXEC TSIVCLR

MAP=nnnnn

You must define the QDAS Share File with a DLBL statement, using the DTF name

TSIVFLE. You can specify any dataset name; TSIVCLR assigns the actual name in the

format shown above.

Use standard complete EXTENT and ASSGN statements to complete the definition of

TSIVFLE.

DASD Space Requirement for the File

CKD 1 track

FBA 96 blocks

To minimize arm movement, we recommend that the file be created close to the VTOC.

Failing to create a QDAS Share File on a shared volume may result in disk dataset

corruption on that volume.

BIM-EPIC Release 6.3 allows MAP= values greater than the previous maximum of 2044.

QDAS Share Files created prior to the 6.3 release can be used by 6.3, and QDAS Share Files

created under Release 6.3 can be shared between CPU’s using 6.3 and CPU’s using earlier

releases as long as a Share File created under Release 6.3 does not have a MAP= value

larger than 2044. If a QDAS Share File is created under Release 6.3 with a MAP= value

larger than 2044, that file and the DASD it controls CANNOT be shared with BIM-EPIC

releases prior to Release 6.3. File and VTOC corruption are guaranteed if this rule is not

observed.

The required MAP control statement specifies the number of VTOC entries (active extents)

that the QDAS Share File supports. Its value must not be less than the value of the TSIVDEF

MAP parameter for the same volume (see below).

Description

WARNING!

Control Statements

1 2 ... 76 77 78 79 80 81 82 83 84 85 86 ... 358 359

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Memorex LOCK - VERSION 2-24 Specifikace Strana 81