These critical, and now adjustable, thresholds have been covered to some extent previously. However, some re-enforcement is always useful. When adjusting thresholds, it is vital to understand what they mean, and the potential impacts of changes. Adjusting them incorrectly will certainly hurt performance. The HPSEQT and HPPSEQT thresholds determine how much (if any) sequentially accessed data, and data read in using parallel sequential access will be cached in the HP. This should be carefully evaluated to determine if the pages will be re-referenced in the near term. If not, then these should be set to ZERO. Unless a VP is dedicated to scanned objects with frequently re-referenced pages and ‘not large working sets’, it is usually not beneficial to allow sequentially accessed data to migrate to a HP.