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If you increase this parameter, consider that:
More data per transaction will increase server recovery log requirements.
Check log and log pool space to ensure that there is enough space, and
remember that a larger log may increase server startup time.
More data per transaction may result in more data being retransmitted if a
retry occurs. During a retry, all objects belonging to the current transaction
need to be retransmitted, which can decrease performance.
Tip: Check your client log files for retransmission attempts during backups.
They can occur, for example, when a file grows because client
compression is enabled and the
The benefits of changing this parameter are subject to configuration and
workload characteristics. In particular, this parameter benefits tape storage
pool backup more than disk storage pool backup, especially if the workload
consists of many small files.
When setting the size of transactions, consider setting a smaller size if you are
experiencing many resends due to files changing during backup when using
static, shared static, or shared dynamic. This applies to both static and shared,
because when a client detects that a file has changed during backup and
decides not to send that file, it still has to re-send the other files in the
transaction.
RESOURCEUTILIZATION
The RESOURCEUTILIZATION client option regulates the level of resources
(that is, number of concurrent sessions) the Tivoli Storage Manager client and
server can use during processing.
Tivoli Storage Manager clients are automatically multi-session capable and this
function is transparent to the end user. However, the RESOURCEUTILIZATION
parameter allows the user to customize the function.
This option increases or decreases the ability of the Tivoli Storage Manager
client to create multiple sessions. The value of RESOURCEUTILIZATION does
not represent the amount of sessions created by the client - it specifies the level
of resources the Tivoli Storage Manager server and client can use during backup
or archive processing. During backup or archive, the higher the value, the more
sessions the client can start if it deems necessary.
The parameter can range from 1 to 10. When the option is not set, which is the
default, only two sessions are created to the server. One session is opened for
querying the server and the other for transferring file data.
compressalways
option is set to
Chapter 15. Performance considerations
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