DOCUMENT:Q178202 09-AUG-2001 [winnt] TITLE :Fix for Loss of Data Records or Partial Records Written to Disk PRODUCT :Microsoft Windows NT PROD/VER:WinNT:3.0,4.0 OPER/SYS: KEYWORDS:kbinterop kbWinNT400sp4fix ====================================================================== ------------------------------------------------------------------------------- The information in this article applies to: - Microsoft Windows NT Server version 4.0 - Microsoft Windows NT Server, Enterprise Edition version 4.0 - Microsoft Internet Information Server 3.0 - Microsoft Windows NT Server version 4.0, Terminal Server Edition ------------------------------------------------------------------------------- SYMPTOMS ======== Internet Information Server (IIS) 3.0 logging supports periodic flushing of log file data to disk. By default this interval is five minutes, however you can modify this setting by changing the following registry entry: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\InetInfo \Parameters\LogFileFlushInterval NOTE: The above registry key is one path; it has been wrapped for readability. In certain circumstances, data may be lost if the buffer is prematurely flushed. Overall, this leads to a loss of data records or partial records written to disk. CAUSE ===== This problem occurs if the lock that protects file data in the periodic flush path is not acquired. This problem happens specifically in the case where the log flush size registry value is set to a large buffer size (for example, 32MB instead of the default 64k). HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\InetInfo \Parameters\LogFileBatchSize NOTE: The above registry key is one path; it has been wrapped for readability. RESOLUTION ========== The fix is to acquire the file-data lock and hence protect against premature flushes or loss of log data. To resolve this problem, obtain the latest service pack for Windows NT 4.0 or Windows NT Server 4.0, Terminal Server Edition. For additional information, please see the following article in the Microsoft Knowledge Base: Q152734 How to Obtain the Latest Windows NT 4.0 Service Pack This problem does not occur in Internet Information Server version 4.0. STATUS ====== Microsoft has confirmed this to be a problem in Internet Information Server version 3.0. This problem was first corrected in Windows NT 4.0 Service Pack 4.0 and Windows NT Server 4.0, Terminal Server Edition Service Pack 4. Additional query words: 4.00 3.00 ====================================================================== Keywords : kbinterop kbWinNT400sp4fix Technology : kbWinNTsearch kbWinNT400search kbWinNTSsearch kbWinNTSEntSearch kbWinNTSEnt400 kbWinNTS400search kbWinNTS400 kbNTTermServ400 kbNTTermServSearch kbiisSearch kbiis300 Version : WinNT:3.0,4.0 Issue type : kbbug Solution Type : kbfix ============================================================================= 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.