IBM E16RMLL-I Implementation Guide - Page 550
When all is said and done with regard to performance, one thing should be clear
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Please keep in mind that this is only a single small test in our lab, but it should be sufficient to explain the major advantages of journaling to you. We recommend that you leave the journal database size set to unlimited. Limiting the journal database size could potentially cause the journal to become invalid, and then Tivoli Storage Manager would resort to a full incremental backup. Of course, the journal size will depend on how many distinct files and directories are updated or deleted between backups, and hence on how much activity the file system sees. Very active file systems will need more space for the journal database than inactive file systems. We also recommend placing the journal database on a disk with at least 1 GB of free space. If free disk space is limited, consider performing backups more frequently than once per day, as this will also limit the journal database size. 15.7 Summary When all is said and done with regard to performance, one thing should be clear: This job is never complete. As your client workload changes, your network configuration will evolve, the amount of managed data will increase, databases and their specialized client requirements will change, and hardware will get faster. All of these factors combine to move bottlenecks around your environment in an endless game of cat and mouse. 520 IBM Tivoli Storage Manager Implementation Guide
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