Microsoft KB Archive/126284

= Problem Running SMS on CNTFS Partition =

Article ID: 126284

Article Last Modified on 10/27/2006

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APPLIES TO


 * Microsoft Systems Management Server 1.0 Standard Edition
 * Microsoft Systems Management Server 1.1 Standard Edition

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This article was previously published under Q126284





SYMPTOMS
Systems Management Server version 1.0 performance degrades after upgrading to Windows NT Server version 3.51.



CAUSE
Windows NT version 3.51 includes support for file compression on Windows NT file system (NTFS) partitions (called Compressed NTFS [CNTFS]). CNTFS is based on a new compression file attribute. If SMS resides on a CNTFS partition, both SMS and CNTFS may attempt compression of the same files. This imposes unneeded overhead.

For example, if the SMS Scheduler compresses a package for distribution, a compressed data stream is written to a file. If the file attributes have the compression bit set, CNTFS attempts to compress this data stream when writing to the disk. Redundant compression attempts waste server resources causing performance to degrade.



WORKAROUND
To prevent this redundant operation, ensure that directory and file attributes in the SMS\SITE.SRV directory and subdirectories do not have the compression bit set. To do this, type the following at the MS-DOS command line: COMPACT /U /I /S :\SMS\SITE.SRV\*.* where  is the host drive of the SMS installation. This clears the compression bit on current files and directories and prevents CNTFS from compressing the files in the future. SMS still compresses package files according to its own configuration settings.

NOTE: In addition to file compression on package files, server performance can also be affected by the compression of files located in the subdirectories below LOGON.SRV. If these files are compressed by CNTFS, additional server overhead is required to make the data available to SMS clients.



STATUS
Microsoft has confirmed this to be a problem in Systems Management Server versions 1.0 and 1.1. We are researching this problem and will post new information in the Microsoft Knowledge Base as it becomes available.

Additional query words: sms prodsms

Keywords: kbnetwork kbscheduler KB126284

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