Mounting a New Volume

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.

Changing tape volumes on a UNIX system

Sequence

Operator using isql

SAP ASE

Backup Server

1

Issues the dump database command

2

Sends dump request to Backup Server

3

Receives dump request message from SAP ASE

Sends message for tape mounting to operator

Waits for operator’s reply

4

Receives volume change request from Backup Server

Mounts tapes

Executes sp_volchanged

5

Checks tapes

If tapes are okay, begins dump

When tape is full, sends volume change request to operator

6

Receives volume change request from Backup Server

Mounts tapes

Executes sp_volchanged

7

Continues dump

When dump is complete, sends messages to operator and SAP ASE

8

Receives message that dump is complete

Removes and labels tapes

Receives message that dump is complete

Releases locks

Completes the dump database command