SFM: Macintosh Computers Create a Lot of Network TrafficID: Q150879
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Macintosh clients' refresh rate may create a bottleneck in the Windows NT server. The Macintosh client issues a "GetVolParms," which is designed to refresh the directory of a mounted volume for file updates on any Macintosh running System 7.x or higher.
When a Macintosh client mounts a Windows NT Server Macintosh volume, the
client will send a "GetVolParms" to the server every 10 seconds for the
first 10 volumes mounted. When you have a large number of Macintosh clients
connected to multiple Windows NT volumes, the Macintosh clients will create
a bottleneck in the server's bandwidth for the network card resources.
Apple Computer has configured this refresh rate to adjust itself according
to the number of volumes. If the number of volumes mounted is greater than
10, the "GetVolParms" adjusts itself so that the number of volumes equals
the number of seconds for refresh rate. For example, if you have a
Macintosh with 20 volumes connected, then the refresh rate will be 20
seconds for each of the volumes. If you have two hundred clients and each
client has two volumes mounted, there will be four hundred (200x2) requests
every ten seconds for a total of 2400 requests per minute.
The "GetVolParms" is a looping structure that will continue until the
volume is disconnected. As soon as the "GetVolParms" is issued the
internal counter will reset and wait ten seconds, depending on number of
volumes mounted, and regardless of when the reply returns to the Macintosh
client. If the "Current Queue Length" is busy and Windows NT Server takes
five seconds to respond, the next request will occur in five seconds.
For individuals who wish to optimize their Macintosh Clients, third party
products like Less Talk will allow the user or the administrator to
configure and control the polling interval for each mounted volume.
Less Talk is manufactured by Information Presentation Technologies, Inc., a
vendor independent of Microsoft; we make no warranty, implied or otherwise,
regarding this product's performance or reliability.
Information Presentation Technologies, Inc.
555 Chorro St., Ste. A
San Luis Obispo, CA 93405
805-541-3000
805-541-3037 (fax)
The third-party contact information included in this article is provided to
help you find the technical support you need. This contact information is
subject to change without notice. Microsoft in no way guarantees the
accuracy of this third-party contact information.
Additional query words: prodnt Slow Hang
Keywords : kbnetwork ntmac NTSrv NTSrvWkst
Version : 3.1 3.5 3.51 4.0
Platform : winnt
Issue type : Last Reviewed: February 18, 1999