Friends,
we are running a F740 in a heterogenous NFS/SMB environment. While we are completely happy on NFS performance SMB performance is not what we would like it to be. But it is only on some Win95 and NT 4.0 where then throughput is low, other Win95 and NT 4.0 systems with the same configuration are fine (as far as you are able to state that two Windows installations are the same). Looking to our 3Com switches shows us that it is not an issue on the ethernet level. I personally guess that it is a protocol issue between the NetApp and Microsoft implementation of CIFS/SMB/NetBIOS over TCP/IP but I'm unable to verify this.
Any ideas where we might start looking ? Has anyone experienced a similar issue ?
regards
alfred
Alfred, How many interfaces do you have configured on the Netapp? Your network maybe segmented off so as only Unix traffic is to go down certain network paths and NT traffic is to go down certain network paths. For example, your network people may have turned off netbios ports 137 -139 on certain routers between the Filer and the NT clients. The Filer will broadcast all of its IP addresses to your WINS servers. Since WINS assigns IP addresses in a round robin fashion, the WINS server will pick IP addresses which are designated for the Unix network, which will cause issues for those NT clients. This is easily fixed on the Netapp side with the "-wins" in the ifconfig lines for the interfaces on the Unix network.
Let me know if this helps, Mike
-----Original Message----- From: owner-toasters@mathworks.com [mailto:owner-toasters@mathworks.com]On Behalf Of Alfred Lerch Sent: Thursday, September 28, 2000 3:07 AM To: Toasters Subject: Low SMB throughput
Friends,
we are running a F740 in a heterogenous NFS/SMB environment. While we are completely happy on NFS performance SMB performance is not what we would like it to be. But it is only on some Win95 and NT 4.0 where then throughput is low, other Win95 and NT 4.0 systems with the same configuration are fine (as far as you are able to state that two Windows installations are the same). Looking to our 3Com switches shows us that it is not an issue on the ethernet level. I personally guess that it is a protocol issue between the NetApp and Microsoft implementation of CIFS/SMB/NetBIOS over TCP/IP but I'm unable to verify this.
Any ideas where we might start looking ? Has anyone experienced a similar issue ?
regards
alfred
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-- \\/// / ^ _ \ ( (o) (o) ) --- That's all folks --- +=oOOO=====(_)=====OOOo==========================================+ |Alfred Lerch Mentor Graphics Deutschland GmbH| |Network & System Administrator Elsenheimer Str. 41 - 43| |IT - Business Support Team Munich D-80687 Muenchen, Germany| |email: alfred_lerch@mentor.com Fax : +49 89 57096-400| |Tel. : +49 89 57096-241 Mobile: +49 172 8915200| | | |Helpdesk IT Central Europe in Munich | |Tel. : +49 89 57096-110 internal: 777| |email: helpdesk_dem@mentor.com | +=============Oooo.==============================================+ .oooO ( ) ( ) ) / \ ( (_/ _)
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Alfred Lerch -
Mike Ball