You may need to change tape volumes during the backup and restore process.
If the Backup Server detects a problem with the currently mounted volume, it requests a volume change by sending messages to either the client or its operator console. After mounting another volume, the operator notifies the Backup Server by executing sp_volchanged on SAP ASE.
On UNIX systems, the Backup Server requests a volume change when the tape capacity has been reached. The operator mounts another tape and then executes sp_volchanged.
|
Sequence |
Operator using isql |
SAP ASE |
Backup Server |
|---|---|---|---|
|
1 |
Issues the dump database command |
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|
2 |
Sends dump request to Backup Server |
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|
3 |
Receives dump request message from SAP ASE Sends message for tape mounting to operator Waits for operator’s reply |
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|
4 |
Receives volume change request from Backup Server Mounts tapes Executes sp_volchanged |
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|
5 |
Checks tapes If tapes are okay, begins dump When tape is full, sends volume change request to operator |
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|
6 |
Receives volume change request from Backup Server Mounts tapes Executes sp_volchanged |
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|
7 |
Continues dump When dump is complete, sends messages to operator and SAP ASE |
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|
8 |
Receives message that dump is complete Removes and labels tapes |
Receives message that dump is complete Releases locks Completes the dump database command |