HP B6960-96035, Руководство по концепциям

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NOTE:
Clusters do not support a SCSI bus with shared tapes. To bring high availability also to
Media Agents, the Fibre Channel technology can be used as an interface to the device.
The device itself is not highly-available in this configuration.
This configuration allows the following features:
• Customizable automatic restart of backups in case of failover of the Cell Manager.
The Data Protector backup specifications can be configured to be restarted in
case of failover of the Cell Manager. Restart parameters can be defined using
the Data Protector GUI.
• System load control at failover.
Sophisticated control is provided to define Data Protector behavior at failover. A
special command,
omniclus
, is provided for this purpose. The Cell Manager
allows the administrator to define what should happen in such situations.
• If the backup is less important than the application that just switched to the
backup system, Data Protector can abort the running sessions.
• If the backup is more important or it is just pending, Data Protector continues
the sessions.
The following is the expected backup behavior under this configuration.
Table 5 Backup behavior
Result Condition
Successful backup Failover before a
backup starts
IMPORTANT
To restart the session,
the appropriate Data
Protector option must be
selected. For information
on defining all possible
Data Protector actions in
case of failover of the
Cell Manager, see the
online Help index:
"cluster, managing
backups".
Filesystem/disk image backup The
backup session fails. The completed
objects from the session can be used
for restore, the failed (running and
pending) objects are backed up again
by restarting the session automatically.
Failover of the
application and the Cell
Manager during backup
activity (Cell Manager
runs on the same node
as the application).
Application backup The backup
session fails. The session is restarted
automatically.
Planning your backup strategy 90