Memorex LOCK - VERSION 2-24 Especificaciones descargar pdf (Pagina 28)

EDD Disk Information BIM-EPIC Dataset Definitions (EDDs)

1-14 User Reference

EDD Disk Information

The CISIZE field 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 to be written on FBA devices.

Block size and CISIZE are mutually exclusive; you can only specify one of these in a BIM-

EPIC dataset definition.

The disk pool name field is used to assign disk datasets to a disk pool. Disk pools are created

by the systems programmer. They are referenced by a six-character pool name which can be a

real volume serial number or an assigned name.

The systems programmer can establish CPU or partition-independent disk pools. To specify

CPU and partition-independent pools, use three dashes at the end of the pool name (for

example, POL - - -). For partition-independent pools, use two dashes at the end of the name

(for example, POOL - -).

If you don’t assign a pool, and a default pool has been specified by the DEFPOL configuration

option, the dataset will be assigned to the default pool.

The primary extent size field defines the number of tracks or blocks to be allocated to the first

extent. The minimum size is 1 CKD track or your CISIZE for FBA.

Secondary extents are allocated automatically to a version of a sequential disk dataset when

the primary extent is filled. Secondary extents are only supported for programs that use

logical IOCS and programs that use physical IOCS programs if they support secondary

allocations.

The secondary extent size field defines the number of tracks or blocks to be allocated to every

extent after the first. The default secondary extent size is 50% of the size of the primary

extent.

You can specify the maximum number of secondary extents allowable for a single dataset

version. The maximum is 255.

Allocation by logical records (ALR) is used to calculate the size of the primary extent

automatically. It overrides the primary extent size field. BIM-EPIC calculates the extent size

based on:

•

record length

CISIZE

Disk Pool Name

Primary Extent Size

Secondary Extent

Size

Number of

Secondary

Allocations

Allocation by

Logical Records

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Memorex LOCK - VERSION 2-24 Especificaciones Pagina 28