Article ID: 126284
Article Last Modified on 10/27/2006
APPLIES TO
- Microsoft Systems Management Server 1.0 Standard Edition
- Microsoft Systems Management Server 1.1 Standard Edition
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 <x>:\SMS\SITE.SRV\*.*
where <x> 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