IBM E16RMLL-I Implementation Guide - Page 303
HSM or Space Management clients using IBM Tivoli Storage Manager
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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 tsm: ATLANTIC> define mgmtclass server server data migdestination=NONE description="Default management class for Server domain" ANR1520I Management class DATA defined in policy domain SERVER, set SERVER. tsm: ATLANTIC> assign defmgmtclass server server data ANR1538I Default management class set to DATA for policy domain SERVER, set SERVER. tsm: ATLANTIC> define mgmtclass server server directory migdestination=NONE description="Directory management class for Server domain" ANR1520I Management class DIRECTORY defined in policy domain SERVER, set SERVER. Chapter 7. Data storage policies 273