We have identified bug 30873 which can impact CIFS performance in ONTAP 6.0 when the number of active CIFS sessions on a filer exceeds 200.

Symptoms of the problem can be client session disconnects, hangs or very poor CIFS performance. A 'cifs stat' would typically show the counter named 'Max pBlk Exhaust' to be a very high number - 100,000s or more.

We have identified the root cause of this problem and have developed the fix which is currently undergoing QA and load testing.

ONTAP release 6.0R1 is tentatively scheduled to be released by the end of this week to resolve this bug.

You can view the online bug report on the NOW site at:

http://now.netapp.com/NOW/cgi-bin/bugfind.on?bugs=30873&rels=

On this same link, you can click on "Bug Watcher" to be automatically notified when the bug fix has been released.

Rod Bagg Manager, Sustaining Engineering Network Appliance

408-822-6042 (office) 408-205-9533 (cell) 408-994-2696 (pager) 408-822-4410 (fax)

Get answers NOW! - NetApp On the Web http://now.netapp.com

-----Original Message----- From: Datta, Diptish Sent: Monday, September 25, 2000 12:19 PM To: Bagg, Rod Subject: FW: ontap 6.0 only 350 cif-sessions?

From: andrew-m.webster@db.com [mailto:andrew-m.webster@db.com] mailto:[mailto:andrew-m.webster@db.com] Sent: Friday, September 22, 2000 8:17 AM To: ulrich.neumann@brose.de Cc: toasters@mathworks.com Subject: Re: ontap 6.0 only 350 cif-sessions?

Greetings from Japan,

We had much the same issue. If you are seeing the same thing, then the "Max pBlk Exhaust" from the "cifs stat" goes into the millions. It's normally at 0. We had to rollback to OnTap 5, which wasn't that easy. We basically had a full day outage, which for an Investment Bank was a very bad thing. :-( Regards

-- Andrew Webster PC, NetApp Filer, TSM Sanno Move Project Deutsche Real Estate Consulting Ltd. - Tokyo Internal (but outside Tokyo): 88 408-7542 Tel. +81-3-5156-7542 Fax. +81-3--5156-4811 Mobile: 0907 184 8958

Andrew-M.Webster@db.com

---------------------------------------- Message History

From: ulrich.neumann@brose.de on 22/09/2000 12:16 PM GMT

To: toasters@mathworks.com cc: Subject: ontap 6.0 only 350 cif-sessions?

we just upgrated to ontap 6.0 on out clustered f760. unfortunately wehn more than 350 connection over cifs are established, the filer isn't responding anymore. the http and nfs-connections word furthermore. only the cifs connections are lost an d cannot be established. after a reboot the filer works till around 350 connections.

any ideas?

greetings from germany Brose Fahrzeugteile Client-Server-Technologien

Ulrich Neumann