Planning for journal use of auxiliary storage
If you are journaling an object, journal management writes a copy of every object change to the journal receiver. It writes additional entries for object level activity, such as opening and closing the object, adding a member, or changing an object attribute. If you have a busy system and journal many objects, your journal receivers can quickly become very large.
The maximum size for a single journal receiver varies. It depends on how the system allocates the journal receiver across multiple disk arms. The maximum size ranges from approximately 1.9 GB to 1.0 TB depending on what value you specified for the associated journal's receiver size option.
To avoid possible problems with a journal receiver exceeding the maximum size allowed on the system, specify a threshold for the receiver of no more than 900 000 000 KB if you specified a journal receiver maximum-size option for the associated journal. Otherwise, specify a threshold of no more than 1 441 000 KB.
The following topics provide more information about how journal management affects auxiliary storage:
- Functions that increase the journal receiver size
- Methods to estimate the size of a journal receiver
- Methods to reduce the storage that journal receivers use
- Determine the type of disk pool in which to place journal receivers
- Journals and independent disk pools