IBM E16RMLL-I Implementation Guide - Page 527
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Figure 15-1 on page 497 shows the side effects of placing multiple storage pool volumes on a single disk. The increased seek activity can degrade performance. 1 TSM volume per physical disk 2 TSM volumes per physical disk Partition or logical volume TSM volume Used space Space being written to in current transactions Volumes shown assuming all data was previously migrated. Increased seek activity can degrade performance. Use only one volume per physical disk. Figure 15-1 Tivoli Storage Manager volume definitions It is also preferable to send backups of large amounts of data, such as entire client databases, directly to tape instead of buffering in a disk storage pool. This allows the client to take advantage of the high streaming performance of most advanced tape drives when writing large files and avoids extra data movement from the migration process, which will likely be immediately triggered. Backups of file servers and workstations should be directed to a disk storage pool to avoid tape mount delays. Also, a disk storage pool supports more multiple sessions than the available tape devices. 15.2.3 Versioning Keeping a lot of different backup versions of files makes the Tivoli Storage Manager server database larger. A larger server database will not be accessed as fast as a smaller one and requires more time for backup and inventory expiry operations. The planning process is important in order to make sure you keep only as many versions as really needed. Chapter 15. Performance considerations 497
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