Tags

,

Perfmon and ReadyBoost

When the ReadyBoost Cache header is added to Performance Monitor, it actually adds ten (10) counters to the monitor.

Perfmon03

The definitions of the various counters are:

  1. Bytes Cached: The total amount of uncompressed data currently stored in the cache.

  2. Cache Space Used: The total amount of space currently being used by the cache.
  3. Compression Ratio: The actual size of the data in the cache divided by the uncompressed size of the data in the cache.
  4. Total Cache Size Bytes: The total amount of space reserved on the device for the cache.
  5. Cache Reads/Sec: The number of times data is read from the cache per second.
  6. Cache Read Bytes/Sec: The number of bytes read from the cache per second.
  7. Skipped Reads/Sec: The number of read operations skipped per second.
  8. Skipped Read Bytes/Sec: The number of bytes not read from the cache per second.
  9. Total Reads/Sec: The number of read operations directed to ReadyBoost. (Includes both satisfied and skipped read operations.)
  10. Total Read Bytes/Sec: The number of bytes in the read operations directed to ReadyBoost. (Includes both satisfied and skipped read operations.)

Perfmon04

We focused on how much the ReadyBoost cache is being used to deliver data, so we chose Cache Reads/Sec and Cache Read Bytes/Sec. These two counters will help gauge the amount of read activity occurring in the cache and how much data is being delivered from the cache. How often ReadyBoost is deferring to the hard disk for reading data from the cache can be seen in Skipped Reads/Sec and Skipped Read Bytes/Sec.

Advertisements