User's Manual

220 Backup, restore, and recovery
Additionally, a well defined FSE backup policy with regular backups prevents the excessive growth of the
transaction log files of the Hierarchical Storage Management Databases (HSMDBs) and File System
Catalogs (FSCs). The transaction log files are committed into the main databases during the FSE backup
process.
Recovery methods for FSE components
The following table lists FSE components, their descriptions, and provides notes on possible recovery
methods.
FSE component Description Recovery method
HSM file system
(client-specific data)
Stores your directories and files, file
system structure, file attributes, and
metadata.
• HSM file system recovery
(see ”
HSM file system
re
covery
” on page 236)
Hierarchical Storage Management
Database (HSMDB)
(client-specific data)
Contains migration and release
candidate lists for files on the HSM
file system. The restore of this
database recreates the state of
restored files; without it, the state of
files cannot be recreated during
restore, preventing files from being
migrated and released.
• None (recovery of HSMDB is
not needed if HSM file system
is recovered)
File System Catalog (FSC)
(client-specific data)
Contains Data Location Catalog with
information about locations of
migrated data on FSE media, as well
as Name Space Catalog with
metadata information on files, and is
therefore needed to access files on
FSE media.
• File System Catalog recovery
(see ”
File System Catalog
re
covery
” on page 235)
• Restore
(see ”
Restore” on page 230)
Resource Management Database
(RMDB)
Contains records of all configured
FSE resources, for example, libraries,
drives, pools, and media. In
addition, it stores all relevant
resource information, such as
configuration parameters, resource
characteristics, current resource
status, usage statistics, and relations
to other resources. In case it is not
backed up, the whole resource
configuration is lost.
• Restore
(see ”
Restore” on page 230)
Configuration Database (CfgDB) Contains currently used and old
revisions of the FSE configuration files
for configured FSE resources; without
it, all FSE configuration files are lost.
• Restore
(see ”
Restore” on page 230)
Fast Recovery Information (FRI) FRI for all open media volumes is
stored on disk on the consolidated
FSE system or FSE server. It must be
included in the backup since it is not
yet recorded on media.
• FRI recreation
(see ”
Recreating Fast
R
ecovery Information from
med
ia
” on page 120)
• Restore
(see ”
Restore” on page 230)