DOCUMENT:Q172912 09-AUG-2001 [winnt] TITLE :Windows NT May Appear to Hang When a Mirrored IDE Drive Fails PRODUCT :Microsoft Windows NT PROD/VER:WinNT:3.5,3.51,4.0 OPER/SYS: KEYWORDS:kbhw kbHardware ====================================================================== ------------------------------------------------------------------------------- The information in this article applies to: - Microsoft Windows NT Server versions 3.5, 3.51, 4.0 ------------------------------------------------------------------------------- SYMPTOMS ======== When you perform Windows NT mirroring on a computer using IDE drives and the master drive on the Primary channel fails, the system may appear to stop responding. You may also experience very erratic mouse movement. This can happen even if the system drive is configured as master on the primary EIDE controller and shadow drive is configured as master on the secondary EIDE controller. CAUSE ===== When your computer is running Windows NT, the ATAPI device driver continues to request communication to the primary EIDE device on the master channel. This process will eventually timeout and Windows NT will then continue to run by using the primary (shadow) drive on the secondary channel. The length of this timeout delay depends on the processes running and the specific hardware in use. RESOLUTION ========== Because of the nature of IDE architecture, the system may appear to stop responding or erratic mouse movement may occur. This behavior is expected when a mirrored IDE drive fails. If an instantaneous switchover from the primary drive to the shadow drive of the mirror set is desired, then switching to a SCSI-based disk subsystem is recommended. MORE INFORMATION ================ When the original system or boot drive fails, you will have to use a Windows NT boot floppy disk to start from the shadow partition or reconfigure the shadow disk drive as the master disk drive on the primary controller. If the drives are not the same geometry, then you may still not be able to boot off the shadow drive even when moved to the primary drive's position on the IDE channel. For additional information, please see the following articles with related topics in the Microsoft Knowledge Base: Q141702 How to Recover Mirroring Windows NT Using IDE devices Q119467 Creating a Boot Disk for an NTFS or FAT Partition Q114779 Overview of Disk Mirroring (RAID Level 1) in Windows NT Q128630 How to Recover From a STOP 0x00000058 FTDISK_INTERNAL_ERROR ====================================================================== Keywords : kbhw kbHardware Technology : kbWinNTsearch kbWinNT351search kbWinNT350search kbWinNT400search kbWinNTSsearch kbWinNTS400search kbWinNTS400 kbWinNTS351 kbWinNTS350 kbWinNTS351search kbWinNTS350search Version : WinNT:3.5,3.51,4.0 ============================================================================= 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.