19.3 Add Memory for Disk Caching on Windows

Windows systems have a dynamic disk buffer cache. As much main memory as possible is used to cache blocks of data files that have been updated by user processes. Periodically, the disk buffer cache is flushed to disk. The cache size increases when you add more memory to the host.

This feature speeds up disk I/O significantly; making full use of it is an important factor in good ClearCase LT server performance. An inadequate disk buffer cache causes thrashing of VOB database files. The result is a significant performance degradation. These are the symptoms:

• Extended periods required for scrubber and vob_scrubber execution

• ClearCase LT clients experience RPC time-out errors

There is additional information about the relationship of main memory to VOB size in VOB Server Configuration Guidelines.