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Administrator's Reference

DEFINE LOGVOLUME (Define a Recovery Log Volume)

Use this command to define a new recovery log volume. All recovery log volumes must reside on a random access media.

Attention: You cannot change the size of an allocated recovery log volume after you have defined it to TSM. If you change the size of TSM volumes by using external operating system utilities TSM may not initialize correctly and you could lose data.

Before issuing this command, you must allocate and format the volume by using the ANRFMT job or the ANRFMT2 job found in the SAMPLIB dataset. For information on using these jobs, see Administrator's Guide.

A recovery log volume must be at least 9MB. Storage space is used in 4MB blocks and 1MB is used for overhead purposes. For example, if you define a recovery log volume with a capacity of 9MB, 8MB are available for storage on the volume.

Note:
The maximum size of the recovery log is 13GB. Increasing the size of your recovery log significantly could also significantly increase the time required to restart the server, back up the database, and restore the database.

Privilege Class

To issue this command, you must have system privilege or unrestricted storage privilege.

Syntax

>>-DEFine LOGVolume--volume_name-------------------------------><
 
 

Parameters

volume_name (Required)
Specifies the file name of the recovery log volume. The name cannot contain any embedded blanks or equal signs.

Specify a standard VSAM cluster name. A VSAM cluster name consists of one or more qualifiers, which are delimited by periods. The length of each qualifier is from 1 to 8 alphanumeric characters. The maximum length of the cluster name is 42 characters. An example is TIVSM.BFS.POOL2.VOLA.

Note:
The server does not support VSAM Extended Format Linear Datasets. The server supports VSAM Linear Datasets that have been defined at 4GB or less.

Examples

Task 1

Define a recovery log volume named GLEDDIE.TIVSM.PLOG.

Command:
define logvolume gleddie.tivsm.plog

Related Commands

Table 50. Commands Related to DEFINE LOGVOLUME

Command Description
DEFINE LOGCOPY Creates a volume copy of a recovery log volume.
DEFINE SPACETRIGGER Defines the database or recovery log space trigger.
DELETE LOGVOLUME Deletes a volume from the recovery log.
EXTEND LOG Extends usable log storage within the volumes previously allocated for its use.
QUERY LOG Displays allocation information about the recovery log.
QUERY LOGVOLUME Displays information about log volumes.
UPDATE SPACETRIGGER Changes attributes of the database or recovery log space trigger.


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