For synchronous high-speed backup, execute the swststartsync command to start the synchronous processing. If there is a suspended backup volume at the start of the synchronous processing, then the following devices are selected first, and EC resumes (i.e., the Resume function causes differential copying to start).
The backup volume from which history information is deleted because the number of generations has been exceeded; or
The suspended backup volume without history information.
If there is no suspended backup volume at the start of the synchronous processing, EC (i.e. a full copy) starts.
The process of backup volume selection at the start of the synchronous processing is shown below.
Figure 4.4 Backup Volume Selection at Start of Synchronous Processing
Note
If synchronous processing is started with a device map specified, other transaction volumes and suspended backup volumes cannot be used as the backup destination. To check which transaction volumes are suspended along with their associated backup volumes, execute the swstsyncstat command.
