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90 DB2 Manager User Guide
StorageTek Proprietary
administration facility. The backup duplex copy is created at the
same time as the backup copy.
Each copy will contain a single standard-labeled dataset. The contents of
each copy will be identical. The following dataset naming standards are used
by Archive Manager to identify each copy in an Archive Manager tape
database:
‘A’ copy: ‘hlq.Gnnnnn’
‘B’ copy: ‘hlq.Bs.Gnnnnn’
‘C’ copy: ‘hlq.Cs.Gnnnnn’
‘D’ copy: ‘hlq.Ds.Gnnnnn’
where ‘hlq’ is the high-level qualifier for system datasets, as defined
during Archive Manager database definition processing (see
“Define Archive Manager databases” on page 27).
‘s’ is the storage level (0-7)
and ‘nnnnn’ is the sequence number of the dataset within the
Archive Manager database.
Objects are always written to storage level 0 when first migrated to tape.
They may subsequently be moved to other storage levels via execution of the
Archive Manager object management utility.
Archive Manager also provides a facility (via its database administration
process) to automatically control the tape cartridge devices to be used to
create each copy during the object migration or backup process
(eg) ‘A’ copy to primary library location. This copy of the database
will be used for normal production access.
‘B’ copy to offsite location. This copy of the database will be
used for disaster recovery purposes.
‘C’ copy to alternate onsite location. This copy of the database
will be used for recovery after loss of an individual volume.
This location may be in another library storage module, for
automated recovery access, or on a free-standing device for
eventual shelf storage.
Note that if duplexing during archival is enabled for the Archive Manager
database, then a duplex tape volume will be created concurrently with the
primary tape volume during database update processing. In some
circumstances (e.g. if the duplex volume is created at a remote offsite
location) it may not be necessary to execute the Archive Manager database
backup utility. Refer to the Archive Manager User Manual for full information
on these considerations.
Archive Manager database recovery