BRMS will use the available storage from the system ASP to determine the size of media images that will be created for automatic transfer to the cloud. The default sizing is 30 GBs but may be lower if adequate storage space is not available on Disk. Review the table below for default sizing based on disk space.
Setting the Media Size Manually
The media size can be overridden by running the following command:
CALL PGM(QBRM/Q1AOLD) PARM('VRTVOLSIZE' '*SET ' 'nnnnnnnnnnnnnnn')
where - nnnnnnn is the media size in megabytes (MB). This value must be between 0000001 (1 megabyte (MB)) and 1000000 (1 terabyte (TB)). Note: The size maybe adjusted slightly to reflect minimum or maximum size of the virtual media.
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Individual cloud connector resources may have different size limitations. S3 cloud resources have a media size limitation of less than 120GB. BRMS recommends using a value of 0099000 (99 gigabytes (GB)) for these cloud resources. |
In 5770-BR2 7.4, 5770-BR2 7.5, and 5770-BR1 7.5 and later, WRKPCYBRM TYPE(*BKU) the Automatic virutual volumes: ‘Virutal volume size’ field was added to support this media size value.
Table: Default media image sizing based on available amounts of disk storage
Available Disk Storage Space | BRMS Default Sizing |
|---|---|
Less than 5 GBs | 1 GB |
5 to 20 GBs | 5 GB |
20 to 50 GBs | 20 GB |
More than 50 GBs | 30 GB |
Displaying the Media Size
The media size can be displayed by running the following command:
CALL PGM(QBRM/Q1AOLD) PARM('VRTVOLSIZE' '*DISPLAY')
Resetting Media Size
The media size can be reset to the default value by running the following command:
CALL PGM(QBRM/Q1AOLD) PARM('VRTVOLSIZE' '*REMOVE')
NOTE: NOTES:
Smaller size tape volumes may transfer quicker to the cloud because transfers can start when a tape volume is unloaded from the virtual drive. This means when a tape volume spans, the cloud transfer of the full volume can start before the backup completes.
When using smaller tape volume sizes, there are reporting limitations in BRMS if more than 50 volumes are used for the backup. If more the 50 volumes are used, the Media_Set_Info table function may be used to return the serial media set information.
Optical volume transfers do not start until the backup completes.
The size may be adjusted slightly to reflect minimum or maximum size of the virtual media.
This will not affect the sizes of optical media when BRMS creates virtual optical media for control groups
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QCLDBIPLxx and
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QCLDBGRPxx . For these, the images will be created with *DVD4700 to enable them to be burnt to physical DVD unless the Cloud NFS Solution is enabled.