Cifs.max_mpx tells the client how many operations can be pending on the filer at the same time. The value should never be set below the NT default of 50 (some early versions of 5.3 set it to 32 which was incorrect). If cifs stat shows Max Multiplex greater than about 32 you need to raise this number. The two engineering approved increases are 253 and 1124. Do not set this to any other values without an explicit conversation with NetApp customer service. One way you can tell how much is enough is to run perfmon on the client consuming the most resources and look at the Redirector\current commands stat. Max_mpx should be set to a healthy margin above that number. It should be noted that just automatically setting this high is not a good idea. High values consume a lot of resources in the clients. That is one of the reasons this is a hidden option. Setting this to an unapproved value will cause errors on some clients http://support.microsoft.com/support/kb/articles/Q232/8/90.ASP. Remember that options.cifs.max_mpx controls a number passed in the initial connection of a client to the filer. Changing this value will not affect active sessions. For this reason we recommend only changing this option when cifs is terminated. Once cifs restarts you can insure that all connections will have the new value There is a similar parameter on an NT server. See http://support.microsoft.com/support/kb/articles/q191/3/70.asp

-----Original Message----- From: ZANGA, Michael, GCM [mailto:Michael.Zanga@gcm.com] Sent: Monday, April 17, 2000 8:16 AM To: toasters@mathworks.com Subject: Cifs.max_mpx

Does anyone have any idea what the option cifs.max_mpx does. On a whitepaper from NetApp the option is referenced to be changed to 1124. I presently have it set at 32 and it was hidden.

I am reluctant to make the change without knowing what it does.

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