Chapter 2. Implementation planning
43
2.8.6 Database volume identification
The total required database size including both backup and archive requirements
will be 190 + 1192.32 = 1382.4 MB.
We recommend using the Tivoli Storage Manager mirroring function for the
database instead of a hardware or operating system mirroring, because Tivoli
Storage Manager has additional functions to handle error conditions that may
affect the mirrored copy.
If you are using Tivoli Storage Manager mirroring, you need to plan for the mirror
copy by doubling the amount of disk for the database.
Various file systems have different maximum capacities, so the database may
have to be split across numerous volumes to make up your database size. To
ensure no single point of failure when mirroring the database, each volume in a
mirrored set should be placed on a separate drive and even controller.
Complete Table 2-9 with the database file names and the volume names for your
primary database and copy database. This table includes the space for the
backup and archive requirements.
Table 2-9 Database worksheet - backup and archive requirements
2.8.7 Tivoli Storage Manager recovery log
The size of the recovery log depends on the amount of data changed between
Tivoli Storage Manager database backups. The larger the amount of data, the
larger the recovery log needs to be. Either a full or an incremental Tivoli Storage
Manager database backup (in roll-forward mode) resets the recovery log back to
empty. If the recovery log fills up completely, Tivoli Storage Manager stops and
Note: By summing up backup and archive database sizes, you will have a full,
consolidated database for the calculated time frame. You can start with a
smaller configuration initially but leave enough spare disk space for growth.
You should round up database volume sizes to multiples of 4 MB plus 1 MB for
overhead.
Database volume
File name (primary)
Size
MB
File name (copy)
Size
MB
Vol1
/tsm/database/primary/file01
693
/tsm/database/copy/file01
693
Vol2
/tsm/database/primary/file02
693
/tsm/database/copy/file02
693
Total
1386
Total
1386
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