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Designing Disk Pools Defining the BIM-EPIC Environment

2-40 BIM-EPIC Installation and System Guide

Designing Disk Pools

The TSIDPOL macro defines each disk pool. As you design your disk pools, keep the

following in mind:

• Each disk dataset must be assigned to a pool.

• Uncontrolled datasets are allowed in pool areas.

•

You can define as many disk pools as you wish.

• Choose disk volumes that have the most contiguous free space for your initial pool(s).

• You can use a whole volume or only a partial volume in a pool. However, you can only

define one volume area per pool. If you wish, you can divide the volume into multiple

pools.

• Each pool can contain multiple volumes. If you plan to use Start Track 1 datasets,

remember that BIM-EPIC must search the VTOC to find the dataset’s extents. If you

have multiple volumes in the pool, BIM-EPIC searches each volume’s VTOC in

sequence until it finds the first extent. To improve performance, keep the number of

volumes small for pools which will contain Start Track 1 datasets.

• Do not mix device types in a pool. Although BIM-EPIC allows you to do so, VSE does

not support it.

•

Do not mix disk devices of the same type but different capacities in the same pool. For

example, do not put 3380 single, dual and triple-density volumes (or any combination of

these) in the same pool. If a pool is to contain VM mini-disks, all the disks in the pool

must be of the same size. If you do not observe this rule, you may find that VSE is

unable to process some multi-extent files.

• Leveling is activated by pool.

• Disk pools can be shared by any number of partitions or CPUs.

• Disk pools can also be shared between multiple real and virtual VSE machines if you

define a VSE LOCK file and add the volumes to VSE as SHR. See 2-68 for details.

• If you share your DSN Catalog between machines, you must also share the volumes in

your disk pools between your VSE machines. However, you are not required to share

your pools. You can create a separate TSIDPOL phase for any machine. Simply place

the TSIDPOL phase in a library which is searched before the library in which you have

installed BIM-EPIC.

•

You can deactiavte a specific volume in a pool at any time by using the OFFLINE

function of TSIDMNT. If a pool volume is in VSE’s “device down” (DVCDN) status,

you must place it offline to BIM-EPIC. You can reserve a volume for future use as a

BIM-EPIC pool volume. To do this, define the volume in the TSIDPOL macro and

place it offline. BIM-EPIC ignores the volume until you place it online again with the

ONLINE function of TSIDMNT.

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