To control the behavior of CA Vtape P2P, customize the Group Definitions Primary and ExchangeMetadataOnly. These attributes influence the way network and remote system resources are utilized. In all situations, scratch mounts cause the remote drive to connect to the remote system during the mount. If the connection is dropped, the remote drive reestablishes a connection to the remote system. After a Virtual Volume has been created, the behavior of the remote drive depends on the Group Definitions. These examples show how to customize the Group Definitions.
Example of how to customize the Group Definitions
On the local system, the Group definition contains:
On the remote system, the Group definition contains:
This attribute combination externalizes Virtual Volumes locally and sends as little information over the network as possible. However, the combination still allows the Virtual Volume to be accessed on the drives local of the remote system. This group customization places the least amount of stress on the remote system. Application data does travels over the network only if drives local on the remote system mount a volume that the remote drives create. This is due to the ExchangeMetadataOnly attribute. Additionally, if a Virtual Volume is mounted for read at the local site, no network connections are attempted. However, once a remote drive updates a Virtual Volume a connection with the remote system is established.
Example of how to customize the Group Definitions
On the local system, the Group definition contains
On the remote system, the Group definition contains:
The intent behind this combination of attributes is to leverage a small amount of DASD cache on the local site without needing any physical drives. All permanent copies of the Virtual Volumes are kept on the remote system.
Example of how to customize the Group Definitions
On the local system, the Group definition contains:
On the remote system, the Group definition contains:
The intent behind this combination of attributes is to maintain a highly fault-tolerant environment.
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