Avg. Disk Sec/IO Not a Physical Disk Counter
Article ID: 110847
Article Last Modified on 10/31/2006
APPLIES TO
- Microsoft Windows NT Advanced Server 3.1
This article was previously published under Q110847
SUMMARY
The term "Avg. Disk sec/IO" is incorrectly used in the Windows NT Advanced
Server "Concepts and Planning Guide." On page 194 of the guide under the
heading of "Checking for Excessive Paging," the phrase "Avg. Disk sec/IO"
is referred to as a counter for the physical disk in Performance Monitor.
No such counter exists under the heading physical disk in Performance
Monitor.
MORE INFORMATION
The phrase "Avg. Disk sec/IO" is being used interchangeably with the actual
counter label of "Avg. Disk sec/Transfer" On page 550 of the Windows NT
Advanced Server "System Guide," this is explained. "Avg. Disk sec/IO" is
defined there in terms of average disk-transfer times exactly as "Avg. Disk
sec/Transfer" is defined with the "Explain" button in the Add To Chart
dialog box of the Performance Monitor. The counter "Avg. Disk sec/IO" does
not exist, it just takes the form of "Avg. Disk sec/Transfer."
Also the formula to use for finding excessive paging is vaguely referenced
with the phrase: "To confirm excessive paging, add together the Avg. Disk
sec/IO (a physical disk counter) and Pages/sec counter values." The correct
method is to add "Avg. Disk sec/Read" and "Avg. Disk sec/Write" to get the
number for "Avg. Disk sec/IO (or Transfer)."
Additional query words: prodnt paging file slow
Keywords: kbother KB110847