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the front-end Fibre Channel ports and thus can be presented as a library to a backup application
in the disaster recovery site (note the backup application can only be presented to the target device,
it cannot also be presented to the source device as well).
Figure 56 VLS Recovery Options for a Data Center Rebuild
This target virtual library can be used to restore directly onto new servers that can then be shipped
to the replacement site, or to copy the data to physical tape which can be shipped to the
replacement site and used to rebuild the new servers there. To prepare for the restore process there
are different scenarios depending on which backup application is used for the restore:
If you use a different backup application (not the instance that did the original backups on
the source site), you must recreate the media database information from the replicated
cartridges.
If this is a blank backup application just used for recovery, you can restore the replicated
◦
backup of the media database and then restore from the replicated cartridges that are
fully synchronized. (The most recent backups in the media database may not have been
fully replicated and thus may not be usable for restore.)
◦
If this is a live backup application (for example, it is performing its own local backups in
the target site), you can import the replicated cartridges into the existing backup
application database. You can do this manually at the time of the disaster recovery, or
you can use an automated import script (see
keep the media database roughly in sync with the replication cartridges (less than 24
hours out of date in the event of a disaster recovery).
If you use the same backup application (the instance that did the original backups on the
source site), you need to switch the backup application to "see" the target device instead of
the source device. When you initially configuring this type of solution, you would have needed
to ensure that the target device was not seen by the backup application. (You cannot have
the backup application see two copies of the same cartridge at the same time; see
Application Interaction with
feature in the VLS to hide the target virtual library from the backup application. But in the event
of a disaster recovery, you can perform the sequence shown in
Creating Archive Tapes from the
Replication). One option would be to use the LUN Mapping
Figure 57 (page
VLS Replication Data Recovery Options
Target) to
Backup
122). (The
121
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