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management class to make sure that a copy is taken. A typical example of
this type of file is an application log file that receives messages or errors.
While the application is running, it is likely that the file will be modified with
additional messages or errors while the scheduled Tivoli Storage Manager
backup or archive operations are run. Let us assume that it is determined that
it is OK to back up or archive this file, even if it is being updated, since the file
will still be valid for restore. Since we do not want to stop the application so
that the file is released cleanly for backup, we assign it to a management
class whose specifications (in the backup-archive copy group definitions)
include parameters for treatment of data that is being modified while a
backup-archive operation is being performed. One of these options allows the
file to be backed up even if it is being modified.
IMAGE: This management class is used to store logical volume backups,
should you have such machines. This is useful if you want to handle the
retention period differently for such operations. It is also useful if you further
need to create a separate storage pool to store these backup (a tape storage
pool, for example).
HSM or Space Management clients (using IBM Tivoli Storage Manager for
Space Management) are not covered in this book, but there is a Space
Management parameter in the management class definition that we must change
to avoid problems. The MIGDESTINATION parameter specifies the name of the
storage pool for the migration of space-managed files, and it defaults to a
storage pool that we deleted during the recommended configuration steps. We
point it to a dummy storage pool called NONE, which allows us to validate and
activate the policy set without receiving any error messages.
Example 7-3 shows the management classes for the recommended
configuration defined, using the define mgmtclass command. We assign the DATA
management class as the default class for each policy set, with the assign
defmgmtclass command.
Example 7-3 Defining management classes
define mgmtclass server server data migdestination=NONE
tsm: ATLANTIC>
description="Default management class for Server domain"
ANR1520I Management class DATA defined in policy domain SERVER, set SERVER.
assign defmgmtclass server server data
tsm: ATLANTIC>
ANR1538I Default management class set to DATA for policy domain SERVER, set
SERVER.
define mgmtclass server server directory migdestination=NONE
tsm: ATLANTIC>
description="Directory management class for Server domain"
ANR1520I Management class DIRECTORY defined in policy domain SERVER, set
SERVER.
Chapter 7. Data storage policies
273
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