Interactive Procedure:
1. Select the Save action.
2. Select the parallel medium.
3. Check the entries.
4. Start the save operation.
5. Mount the continuation media and continue the save operation.
Steps 1 to 4 are the same as for saving to several parallel media without continuation medium.
When the capacity of parallel media is not sufficient for the backup, saving is somewhat more complicated than described in Section Saving to Several Parallel Media without Continuation Medium. In contrast to the backup to one medium, all media defined as parallel media can have a continuation medium. For this case, the "number of volumes used for the last save" will be explained in greater detail. Three examples follow in which one parameter is set to a different value for Step 3. It is assumed for the three examples that six media are sufficient for the backup.
After selecting the medium named "tapes_4" as the medium to be used for Backup / Save / Data, CONTROL displays the following screen:
| Example 1: | As few media are to be used as possible. |
| The default number of tapes; i.e., the number of parallel media, | |
| is used as the number of tapes. |
3. Check the Entries
The number of media is set to 4; in the example, this is also the maximum number of parallel media (=MAXBACKUPDEVS). The parameter is important now because the first parallel media do not suffice.
If the data backup is called for the first time, the value of the MAXBACKUPDEVS parameter (4 in the example) appears as the number of media used for the last save.
After clicking on the Ok button, CONTROL displays, for each medium used, a short description and the generation that will be written to the medium as part of the label. The letter of generation is the same for the four tapes ("a").
Example of the label information of the first tape:
4. Start the Save Operation
For tapes selected as media, you must now mount the tape to the tape device if this has not been done yet, because otherwise the backup will fail. Then start the backup by clicking on the Ok button (or the
After confirming all the labels, CONTROL starts the backup displaying an increasing bar to indicate the progress of the backup.
As the four media do not suffice and the value of the parameter is 4, CONTROL expects a continuation medium for just one medium assuming that this is the last.
5. Mount the Continuation Media and Continue the Save Operation
If the medium is a tape, simply mount the next tape and click on the Ok button or press the 
key. If the medium is a file, you can specify the path name of the next file.
You can also change the capacity of the medium, or you can select another type for the next medium.
The save operation is continued with the Ok button.
Step 5 must be repeated as often as is needed to terminate the backup or until it is canceled.
In the "device", "type", and "size" fields, the screen shows the specifications valid for the previous medium. After pressing the 
key, these fields are updatable. In the
"label" field, the label appears that CONTROL will write to the next medium. The "label" field is write-protected.
The Ignore button is meaningless in this case.
As long as the backup is being performed, no other backup can be started. Only after confirming the result protocol, you can start another backup.
Summary of Example 1
If less tapes have been specified than are required (e.g., 4), just one tape device that has become free requests all the needed tapes in succession. This kind of backup takes the most time, but all the tapes except the last one are written up to the end.
| Example 2: | The backup is to be done as fast as possible. |
| The specified number of tapes probably is too large. |
3. Check the Entries
The number of media is set to eight or more.
After clicking on the Ok button, CONTROL displays, for each medium used, a short description and the generation that will be written to the medium as part of the label.
4. Start the Save
As in example 1, confirm the screens to start the save operation.
As the four media do not suffice and the value of the parameter is 8, CONTROL expects a continuation medium for each of the four media.
5. Mount the Continuation Media and Continue the Save Operation
In this case, you must answer the request for a continuation medium four times. If the medium is a tape, simply mount the next tape and click on the Ok button or press the 
key. If the medium is a file, you can specify the path name of the next file. You can also change the capacity of the medium, or you can select another type for the next medium.
The save operation is continued with the Ok button after each continuation medium. As six tapes are sufficient for the backup in the example, CONTROL does not request another continuation medium.
Here, the Ignore button has the effect that the tape device will be ignored and all the tapes to be mounted are immediately expected from the remaining tape devices. This can be useful, for example, if you only want to write the tapes on particular tape devices and no longer on all parallel devices defined.
Summary of Example 2
For eight specified tapes, the four tape devices request another tape as soon as they have become free. The rest of the backup is speeded up because it is done simultaneously to four tapes instead of two.
| Example 3: |
3. Check the Entries
The number of media is set to six.
4. Start the Save Operation
As in example 1.
As the four media do not suffice and the value of the parameter is 6, CONTROL expects a continuation medium for just two media.
5. Mount the Continuation Media and Continue the Save Operation
In this case, you must answer the request for a continuation medium twice. If the medium is a tape, simply mount the next tape and click on the Ok button or press the 
key.
If the medium is a file, you can specify the path name of the next file. You can also change the capacity of the medium, or you can select another type of medium for the next medium.
The save operation is continued with the Ok button after each continuation medium. As six tapes are sufficient for the backup in the example, CONTROL does not request another continuation medium.
Here, the Ignore button has the effect that the tape device will be ignored and all the tapes to be mounted are immediately expected from the remaining tape devices. This can be useful, for example, if you only want to write the tapes on particular tape devices and no longer on all parallel devices defined.
Summary of Example 3
CONTROL uses the number of media used last for this kind of save as the number of tapes (in the example, 6). After about an hour, the four tape devices are ready and request, one after the other, a new tape. In this case, a tape is only requested for two of the four free tape devices; the other two tape devices are ignored by CONTROL.
Batch Call:
No batch call is provided for saving to parallel media with continuation media. We recommend to use external backup tools or autoloaders in this case.