Async Copy Reads/Sec - The frequency of reads from cache pages that involve a memory copy of the data from the cache to the application's buffer. The application will regain control immediately, even if the disk must be accessed to retrieve the page.
Async Data Maps/Sec - The frequency that an application uses a file system, such as NTFS or HPFS, to map a page of a file into the cache to read because it does not wish to wait for the cache to retrieve the page if it is not in main memory.
Async Fast Reads/Sec - The frequency of reads from cache pages that bypass the installed file system and retrieve the data directly from the cache. Normally, file I/O requests will invoke the appropriate file system to retrieve data from a file. This path, however, permits direct retrieval of cache data without file system involvement, as long as the data is in the cache. Even if the data is not in the cache, one invocation of the file system is avoided. If the data is not in the cache, the request (application program call) will not wait until the data has been retrieved from disk, but will get control immediately.
Fast Reads/Sec - The frequency of reads from cache pages that bypass the installed file system and retrieve the data directly from the cache. Normally, file I/O requests invoke the appropriate file system to retrieve data from a file. This path, however, permits direct retrieval of cache data without file system involvement if the data is in the cache. Even if the data is not in the cache, one invocation of the file system is avoided.
Lazy Write Flushes/Sec - The frequency with which the cache's Lazy Write thread has written to disk. Lazy Writing is the process of updating the disk after the page has been changed in memory. In this way, the application making the change to the file does not have to wait for the disk write to be completed before proceeding. More than one page can be transferred on each write operation.
