DOCUMENT:Q110847 08-AUG-2001 [winnt] TITLE :Avg. Disk Sec/IO Not a Physical Disk Counter PRODUCT :Microsoft Windows NT PROD/VER:3.1 OPER/SYS: KEYWORDS:kbother ====================================================================== ------------------------------------------------------------------------------- The information in this article applies to: - Microsoft Windows NT Advanced Server, version 3.1 ------------------------------------------------------------------------------- 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 Technology : kbWinNTsearch kbWinNTAdvSerSearch kbWinNTAdvServ310 kbWinNT310Search Version : 3.1 ============================================================================= THE INFORMATION PROVIDED IN THE MICROSOFT KNOWLEDGE BASE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. MICROSOFT DISCLAIMS ALL WARRANTIES, EITHER EXPRESS OR IMPLIED, INCLUDING THE WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL MICROSOFT CORPORATION OR ITS SUPPLIERS BE LIABLE FOR ANY DAMAGES WHATSOEVER INCLUDING DIRECT, INDIRECT, INCIDENTAL, CONSEQUENTIAL, LOSS OF BUSINESS PROFITS OR SPECIAL DAMAGES, EVEN IF MICROSOFT CORPORATION OR ITS SUPPLIERS HAVE BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. SOME STATES DO NOT ALLOW THE EXCLUSION OR LIMITATION OF LIABILITY FOR CONSEQUENTIAL OR INCIDENTAL DAMAGES SO THE FOREGOING LIMITATION MAY NOT APPLY. Copyright Microsoft Corporation 2001.