Changing DSNTYPE on Datacom areas from BASIC to LARGE

Products

• Datacom
• Datacom/DB
• Datacom/AD

Issue/Introduction

With the majority of areas currently defined as DSNTYPE=BASIC, what steps are needed to convert them to DSNTYPE=LARGE?

Is there any Datacom function or utility that will do this instantly?

Resolution

DSNTYPE is an attribute of a file when it is allocated. Therefore, there is no Datacom function or utility that can change this once the file has been. A new allocation with DSNTYPE=LARGE would be done regardless of whichever method is chosen below. 

Method 1:  Online Area Move (OAM) function would be the recommended approach as you can define the new file with the size and other attributes you want, and then let the MUF handle the move over to the new file and the rename of the file when it is done all without having to go offline. 

Method 2: If you elect not to use OAM, you can still perform the traditional method if you have some down time to run a backup, allocate, and load of the new file.

Additional Information

Review OAM limitations and best practices

Other benefits that OAM provides are to change:

• a Datacom area from NON-SMS to SMS
• a Datacom area from single to multi-volume