LAN Manager Fault Tolerance Corrupts Data on Boot Mirror (112555)
The information in this article applies to:
- Microsoft LAN Manager 2.1
- Microsoft LAN Manager 2.1a
- Microsoft LAN Manager 2.2
This article was previously published under Q112555 SYMPTOMS
The mirroring process for Microsoft LAN Manager produces corruption on
the mirror of the boot volume, most noticeably with large (around 40MB)
files. There are various symptoms. After unmirroring a drive, large files
and their directories may show evidences of corruption: inability to do a
directory on C:\PUBLIC when large files reside there, incorrect data on
the screen when you use the Type command to display a text file[ASCII 146]s contents.
If the drive is unmirrored using FTSETUP, on reboot, CHKDSK finds a number
of corrupt files/directories and removes them from the former mirror.
CAUSE
Some casts of longs to shorts in FTDLL.DLL and FTSETUP.EXE caused sector
runs of greater than FFFF length to be copied incorrectly to the duplicate
drive during the mirroring process, escpecially when drives containing a
lot of data were mirrored.
STATUS
Microsoft has confirmed this to be a problem in LAN Manager versions 2.1,
2.1a and 2.2. A fix to this problem is in development, but has not been
regression-tested and may be destabilizing in production environments.
Microsoft does not recommend implementing this fix at this time. Contact
Microsoft Product Support Services for more information on the availability
of this fix.
| Modification Type: | Major | Last Reviewed: | 9/30/2003 |
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| Keywords: | KB112555 |
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