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Incremental backup is nearly always preferred over selective backup, because
selective backup generates a new version every time, regardless of whether the
specific file has changed or not.
15.2.4 Client configuration
Using the powerful include and exclude options, you can specify the amount of
files to be backed up to a very detailed level. Careful use of these options can
reduce the daily amount of backup data significantly and thus improve both client
and server performance.
15.2.5 LAN-free backup/restore
Using LAN-free backups can unburden LAN traffic significantly, as well as
reduce the overhead on the Tivoli Storage Manager server, since the data is
directly transferred to tape. This feature is important, especially for clients whose
backups are routed to tape directly (databases, for example).
15.3 Tivoli Storage Manager server
In this section we discuss the most common tuning parameters for all Tivoli
Storage Manager servers.
15.3.1 Server database and recovery log
This section covers server options to influence the performance and behavior of
the server database and the recovery log.
BUFPOOLSIZE
Cache storage is provided by the database buffer pool size, which allows
frequently used database pages to remain cached in memory. This means faster
access times and better performance, because the pages can be read and
updated from memory instead of requiring I/O operations to external storage.
The larger the database buffer pool, the more space there is to keep pages in
memory. However, since the buffer pool is implemented in real memory, its size
must be balanced against total memory requirements for the whole system and
any other workloads.
To measure the effectiveness of the database buffer pool, monitor the cache hit
percentage. This number indicates how often a database page request could be
satisfied from the cache as opposed to requiring disk access. An optimal setting
for the database buffer pool is one in which the cache hit percentage is greater
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