Read Errors After Primary Member of Mirror Set Fails (194351)
The information in this article applies to:
- Microsoft Windows NT Server 4.0 Terminal Server Edition
- Microsoft Windows NT Server 4.0
This article was previously published under Q194351 SYMPTOMS
If the system experiences a failure on a mirror set, Windows NT will break
the mirror and orphan the faulty drive. There may be a situation where bad
data is passed back to applications after breaking the mirror. This can
cause a variety of problems, such as application problems and read media
errors on a healthy disk.
In addition to symptoms- A server with hot pluggable disk system (for example: Compaq, HP)
- Mirror set created in the disk system
When you unplug the mirror disk while online from the mirror set (for
example, hardware failure), a warning message is received that the mirror
set is broke. The server and the original disk are functioning correctly.
After you shut down the server, replace the mirror disk and then restart
the system, you may encounter file corruption with the original disk. Disk
Administrator may report a healthy status for the mirror set.
CAUSE
Although one of the mirrored disks was orphaned because of hardware
failure, users continue to use the system without replacing the failed disk
and re-creating the mirror set. During this time, disk I/O is suppose to be
performed only from the partition of the healthy disk.
If an application requests data from the disk, and a read I/O error is
encountered on the healthy disk, Ftdisk.sys erroneously retrieves data from
the orphaned disk, which results in unreliable data from the orphaned disk
being returned to the application as reliable data.
RESOLUTIONTo 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, click the following article number to view the article in the
Microsoft Knowledge Base:
152734 How to Obtain the Latest Windows NT 4.0 Service Pack
-or-
To work around the problem, before you shut down the server and replace the
disk, you should manually break the mirror set in Disk Administrator.
For additional information, please see the following article in the
Microsoft Knowledge Base:
120227
Steps to Recover a Failed Mirrored System/Boot Partition
STATUSMicrosoft has confirmed that this is a problem in Windows NT 4.0 and Windows NT Server 4.0, Terminal Server Edition. 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.
Modification Type: | Major | Last Reviewed: | 6/24/2004 |
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Keywords: | kbbug kbfix KB194351 |
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