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Status Under review
Workspace z/OS
Categories DFSMS Catalog/IDCAMS/AMS
Created by Guest
Created on Jul 23, 2024

RELATED IDEAS

Describe the catalog mapping information for capacity estimation

When we migrated the sequential data sets to SMS environment, the user catalog ran out of space, and many batch jobs were ABEND.

This was due to an increase in the size of catalog entries due to the use of a maximum of 59 for the Volume Count of the SMS Data Class.

If we had known in advance that SMS would increase the size of catalog entries, we could have prevented ABEND.

We think that it is necessary to describe the catalog mapping information for capacity estimation and the increase in the size of catalog entries due to the Volume Count of the SMS Data Class in the manual.

It should also be described in the manual that it is not recommended to specify a large value for the Volume Count of the SMS Data Class.

Applicable Manuals

・z/OS DFSMS Managing Catalogs

・z/OS DFSMSdfp Storage Administration

Idea priority High
  • Guest
    Reply
    |     Aug 1, 2024

    The manual does describe the record sizes but it doesn't specify if those sizes include the SMS STORCLAS,MGMTCLAS and DATACLAS information. The table should show the NONSMS and SMS record sizes so it's clear there's a potential increase in catalog size (and VVDS size), if moving datasets under SMS management. And perhaps another field to show the bytes per volume required with a notation to indicate that this is affected by DYNVOL COUNT.

    DATACLAS DYNVOL COUNT can affect both SMS and NONSMS datasets. It also has an effect on the TIOT size so TIOT or XTIOT can be easily exceeded causing a failure if a job has a lot of DD's referring to multi-volume datasets or ones with a large candidate volume count. Each extra volume uses ~4k bytes of TIOT.

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