IBM E16RMLL-I Implementation Guide - Page 529
query db f=d
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than or equal to 98%. To check the cache hit percentage, use the query db f=d command, as shown in Example 15-17. This shows that our cache hit percentage is 99.89%, which is fine. Example 15-17 query db f=d tsm: LOCHNESS_SERVER1>q db format=detail Available Space (MB): 2,024 Assigned Capacity (MB): 2,024 Maximum Extension (MB): 0 Maximum Reduction (MB): 1,616 Page Size (bytes): 4,096 Total Usable Pages: 518,144 Used Pages: 104,680 Pct Util: 20.2 Max. Pct Util: 20.2 Physical Volumes: 3 Buffer Pool Pages: 65,280 Total Buffer Requests: 37,804 Cache Hit Pct.: 99.89 Cache Wait Pct.: 0.00 Backup in Progress?: No Type of Backup In Progress: Incrementals Since Last Full: 2 Changed Since Last Backup (MB): 113.02 Percentage Changed: 27.64 Last Complete Backup Date/Time: 02/21/2006 17:12:20 Estimate of Recoverable Space (MB): 0 Last Estimate of Recoverable Space (MB): 02/17/2006 12:09:21 Increasing the BUFPOOLSIZE parameter can improve the performance of many Tivoli Storage Manager server functions, such as multi-client backup, storage pool migration and backup, expiration processing, and move data. If the cache hit percentage is lower than 98%, increase the BUFPOOLSIZE value in the server options file. For most servers, we recommend starting with a value of 32768, which equals 8192 database pages. If you have enough memory, increase in 1 MB increments. A cache hit percentage greater than 98% indicates that the proper BUFPOOLSIZE has been reached. However, continuing to raise BUFPOOLSIZE beyond that level may still be helpful. While increasing BUFPOOLSIZE, take care not to cause paging in the virtual memory system. Monitor system memory usage to check for any increased paging after changing the BUFPOOLSIZE. Chapter 15. Performance considerations 499
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