NetApp

OK. I'm not sure if this is the right group to post this in or not.
If not, let me know.

I'm wondering if there's a way to tune the number of simultaneous SMB
connections coming into a NetApp. Also, is there a way of tuning the
maximum number of receive buffers that the NetApp can allocate?

I'm running a F760 w/ 6.5.3P4.

Any guidance would be appreciated. Thanks!

-matt

Matt,

What symptoms are you seeing? Are you trying to limit the number of
SMB connections (now called CIFS)?

Doug

Actually, the opposite. I'm attempting to serve content from the
NetApp to a group of Windows boxes. I'm seeing the following issue
when serving web content off of the NetApp:

"The network BIOS command limit has been
reached"

Microsoft has a KB article,
http://support.microsoft.com/default...b;en-us;810886, which
discusses the error.

On the Windows end you can increase a value in the Registry, MaxCmds,
which increases the number of SMB/CIFS connections to a file server.
If the file server were a Windows file server you would adjust
MaxWorkItems and MaxMpxCt (MaxMpxCount) to tune, that is increase, the
amount of simultaneous SMB connections and increase the number of
receive buffers Windows will allocate to service those connections.

I've ran in a similiar scenario using a Windows 2003 file server and
haven't seen these errors.

Any help you can provide is very appreciated. Thanks.

-matt

On 22 Jun 2005 19:13:26 -0700, "Matt Baldwin"
wrote:

Actually, the opposite. I'm attempting to serve content from the
NetApp to a group of Windows boxes. I'm seeing the following issue
when serving web content off of the NetApp:

"The network BIOS command limit has been
reached"

Microsoft has a KB article,
http://support.microsoft.com/default...b;en-us;810886, which
discusses the error.

On the Windows end you can increase a value in the Registry, MaxCmds,
which increases the number of SMB/CIFS connections to a file server.
If the file server were a Windows file server you would adjust
MaxWorkItems and MaxMpxCt (MaxMpxCount) to tune, that is increase, the
amount of simultaneous SMB connections and increase the number of
receive buffers Windows will allocate to service those connections.

I've ran in a similiar scenario using a Windows 2003 file server and
haven't seen these errors.

Any help you can provide is very appreciated. Thanks.

-matt

You can try mucking with the option cifs.max_mpx. By default it's set
to 50, but it can be set higher.

~F

Thanks Faeander.

Do you know what the max limit is or what a safe limit would be?

Thanks.

-matt

126, 253 and 1124 are approved values. Use only these values and the
smallest value which will correct the situation as this affects
performance.

The most accurate way is to measure the Redirector Current Commands on
the client with Perfmon and to increase the value until the Current
Commands does not reach the negotiated limit.

See Microsoft Q191370 for more information.

Regards,

Doug Vibbert

Don't forget that the Windows Registry key,

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Servic es
LanmanServer\parameters\MaxMpxCt

must also match cifs.max_mpx ...


Brian J. Mitchell
Systems Administrator
TRX
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Atlanta, GA 30329-2158 USA
http://www.trx.com

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