During the backup and restore process, change tape volumes.
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
Adaptive Server.
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 (see Table 11-2).
Table 11-2: Changing tape volumes on a UNIX
system
Sequence
|
Operator using isql
|
Adaptive Server
|
Backup Server
|
|---|
1
|
Issues the dump
database command
|
|
|
2
|
|
Sends dump request to Backup
Server
|
|
3
|
|
|
Receives dump request message from Adaptive
Server
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 Adaptive
Server
|
8
|
Receives message that dump is
complete
Removes and labels tapes
|
Receives message that dump
is complete
Releases locks
Completes the dump database command
|
|
Backup Server cannot dump to multidisk volumes.