3com database adapter module for networker nsr-ora v3.2 User Manual

System Administrator’s Guide

U42252-J-Z915-1-76

NSR-ORA and NetApp

database rarely change, it may be usefull to keep the snapshots for a 
few weeks. If the rate of change is high it may be suffient to keep only 
a few snapshots-by-hour. For a moderate rate of changes it may be 
useful to keep a number of snapshots-by-hour and, additionally, some 
snapshots-by-day. The NetWorker adminstrator and database(s) 
administrator need to work together to tune the parame-ters for a 
particular database.

Using this parameter the administrator can define the percentage of storage 
on a volume that will be reserved to store the snapshot files (15% by default). 
As a NetWorker Administrator you will be informed, if the amount of storage 
available for snapshot backups is running out. To use snapshot backups the 
NAS filer needs an amount of free space on the database volume. With the 
snap_reserve

 command (NetApp) you can reserve this amount of storage. 

Before starting a backup NSR-ORA checks whether the amount of reserved 
free disk space is sufficient or not: If the percentage of usage reaches more 
than 90% of the amount reserved by snap_reserve (e.g. 90% used of 25% 
reserved) then NSR-ORA gives a warning delivered by the savegroup 
completion

 notification of NetWorker.

   With the reserved amount of storage being entirely used for the 

snapshot files NetWorker will use additional free space on the 
database volume for storage (if it is available). This causes no 
reduction of functionality.

The LAST_WEEK_DAY parameter has to be changed, if you want to specify 
a day other than Saturday as the last day of the week to generate the 
snapshots-by-week. By default the value for the LAST_WEEK_DAY 
parameter is set to Saturday but you may set it to any other day of the week. 
This parameter is not queried during configuration with configure_nsrora but 
must be changed manually in the dbo${ORACLE_SID}.init configuration file.

The NFS_SAVE parameter has to be set, if the archivelog files are stored on 
a NAS filer volume, too. The allowed values are 0 (inactive) and 1 (active). 
Choosing NFS_SAVE=1 you activate the backup from NFS-mounted file 
systems for the backup of the archivelog files.