IBM Magstar 3494 manual Virtual Tape Server Recovery Actions

Table 22. Intervention Required Conditions relating to a Virtual Tape Server in the Library (continued)
Intervention Required Condition	Resolution Actions
Message	1.	Contact your service representative.
VTS Controller degraded. Error code yyyyy. Call
service. (VTS z)
Probable Cause
A VTS redundant component has failed. Operation of the
VTS is continuing.
Message	1.	Contact your service representative.
VTS requested that device xxx be made unavailable
but a mount/demount is in progress. (VTS z)
Probable Cause
The VTS determined that device xxx should be made
unavailable; however, the Library Manager found that a
mount or demount was in process and could not mark the
device as unavailable.

Virtual Tape Server Recovery Actions

In the event a Virtual Tape Server is not usable either due to interruption of utility or communication services to the site or through signi®cant physical damage to the site and/or the Virtual Tape Server itself, access to the data managed by the Virtual Tape Server is restored through automated processes designed into the product. The recovery process assumes that the only available elements for recovery are the stacked volumes themselves and further assumes that only a subset of them are undamaged after the event.

Although the recovery process is initiated by a service representative, there are

some customer related actions that are necessary before the recovery can begin.

The customer related actions are:

v If the 3494 and Virtual Tape Server are still functional, ask the service

representative to perform a Force Migrate operation through the library manager

service panel. This will ensure that all data has been moved from the Tape

Volume Cache to a stacked volume.

v Remove the undamaged 3590 stacked volumes from the 3494 Tape Library that

is no longer usable.

v Take the volumes to another 3494 location which has an empty Virtual Tape

Server.

v Inform the service representative that the recovery process can begin.

There are two key functions designed into the Virtual Tape Server system to support recovery.

vAutomatic Virtual Tape Server database backup

The Virtual Tape Server controller maintains a database of information about the location and status of logical volumes on the stacked volumes it manages. When a stacked volume has been ®lled with logical volumes, a backup of the entire database is placed at the end of the ®lled stacked volume. The database contains a time and date stamp that identi®es when the backup was performed.

vAutomatic database recovery

302Magstar 3494 Tape Library Operator Guide