Hallo AndreasThis sounds like bug 68758:http://now.netapp.com/NOW/cgi-bin/bol?Type=Detail&Display=68758The text of the bug is:=====The SNMP MIB entry dfKBytesTotal was deprecated in ONTAP 6.0With the advent of larger capacity volumes, the value of dfKBytesTotal that is retrieved via snmp can be a negative number because the SNMP protocol is limited to a 4 byte integer. Instead use dfHighTotalKBytes and dfLowTotalKBytes to retrieve the whole df value.For ONTAP 6.0 and above please use dfHighTotalKBytes and dfLowTotalKBytes which represent the high and low 32 bits of the total df value. The actual total KBbytes can be determined by the psuedocode:uint8 df_high = dfHighTotalKBytes;uint8 df_low = dfLowTotalKBytes;uint8 df = (df_high << 32) | df_low; /* or (df_high << 32) + df_low; */For systems prior to ONTAP 6.0, if dfKBytesTotal returns a negative number: Use the 'df' command on the console or via rsh to obtain the actual value, or programmatically alter the code doing the SNMP get to understand that a negative value for dfKBytesTotal is a wrap-around condition.===== Kindest regards,Kenneth HealStorage ConsultantSenet Eindhoven bv> Subject: faulty snmp output?> Date: Thu, 21 Jun 2007 18:05:42 +0200> From: andreas.buerger@wincor-nixdorf.com> To: toasters@mathworks.com> > Hi,> > I am just testing with some SNMP on our Filers.> During some tests I mentioned something, I can't explain.> > The SNMP query dfKBytesTotal returns negative output on some volumes:> > > snmpget -v 1 -t 30 -Osq -c public FILER> NETWORK-APPLIANCE-MIB::dfKBytesTotal.19> dfKBytesTotal.19 -2071986176> dfKBytesTotal.20 0> > The equal command directly issued from the filer returns the following:> > > ssh FILER df -k VOLUME> Filesystem total used avail capacity Mounted> on> /vol/VOLUME/ 2222981120KB 2030845132KB 192135988KB 91%> /vol/homes02/> /vol/VOLUME/.snapshot 0KB 40077688KB 0KB ---%> /vol/homes02/.snapshot> > Does anybody have an idea why the snmp output is negative and not same> as the df -k from the filer?> > Here some information of the test environment:> > MIB Version: Version 1.19.3, March 2007 (on filer and localhost)> Filer: FAS3050 with OnTap 7.0.2> > > Best regards> Andreas> > -----------------------------------------> Wincor Nixdorf Int. GmbH> WN CIO4 Computing & Storage> Heinz-Nixdorf-Ring 1> 33106 Paderborn> > Phone: +49 5251 693 4215> Fax: +49 5251 693 4200> Mail: andreas.buerger@wincor-nixdorf.com> -----------------------------------------> > > > > > > _________________________________________________________________ Make every IM count. Download Windows Live Messenger and join the i’m Initiative now. It’s free.  http://im.live.com/messenger/im/home/?source=TAGWL_June07