Memorex LOCK - VERSION 2-24 Informations techniques télécharger pdf (Page 33)

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BIM-EPIC Dataset Definition–Disks

User Reference

Use Pursuant to Company Instructions

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BIM-EPIC Dataset Definition–Disks

Description BIM-EPIC dataset definitions (EDD) for disks consist of several

components. The following sections provide an overview of each

component.

CISIZE CISIZE specifies a CISIZE for FBA devices and forces the dataset to be

written to maximize the number of records written to a control interval.

Use CISIZE instead of block size for datasets written on FBA devices.

CISIZE and block size are mutually exclusive. You can specify only one

of these in an EDD.

Disk Pool Name Use a disk pool name to assign disk datasets to a disk pool. Disk pools are

referenced by a six-character pool name which can be a real volume serial

number or an assigned name. The systems programmer creates disk pools.

The systems programmer can also create CPU or partition-independent

disk pools:

 To specify CPU disk pools, use three dashes at the end of the disk

pool name, for example, POL - - -.

 To specify partition-independent disk pools, use two dashes at the

end of the disk pool name, for example, POOL - -.

If you do not assign a disk pool and a default disk pool has been specified

by the DEFPOL configuration option, the dataset will be assigned to the

default disk pool.

Primary Extent

Size

The primary extent size defines the number of tracks or blocks allocated

to the first extent. The minimum size is 1 CKD track or your CISIZE for

FBA.

Secondary

Extent Size

The secondary extent size defines the number of tracks or blocks

allocated to every extent after the first extent. The default secondary

extent size is half the size of the primary extent.

When the primary extent is filled, secondary extents are allocated

automatically to a version of a sequential disk dataset. Secondary extents

are supported only for programs that use logical IOCS and, if they support

secondary allocations, programs that use physical IOCS.

Secondary

Allocations

You can specify the maximum number of secondary extents allowable for

a single dataset version. The maximum number is 255 secondary extents.

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Memorex LOCK - VERSION 2-24 Informations techniques Page 33

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