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HostMonitor failing to query certain SNMP OIDs

 
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bmekler



Joined: 17 Apr 2012
Posts: 32

PostPosted: Sun Nov 15, 2015 12:16 pm    Post subject: HostMonitor failing to query certain SNMP OIDs Reply with quote

I'm trying to use HostMonitor to keep track of SnapMirror replication lag on a clustered DataOntap 8.3 system using SNMP. I'm already doing it on 7-mode DataOntap systems, but cluster mode uses a different table, and for some reason, HostMonitor is returning blank values when querying it. More specifically:

SNMP GET 1.3.6.1.4.1.789.1.5.4.1.6.1036 on a clustered system properly returns specified (1036) volume used percentage.
SNMP GET 1.3.6.1.4.1.789.1.9.20.1.6.3 on a 7-mode system properly returns the current lag time (in ticks) for the specified SnapMirror relationship (#3 in table)
SNMP GET 1.3.6.1.4.1.789.1.29.1.1.7.4 on a cluster, however, returns a blank value, instead of 'snapmirrorRelLag' for relationship #4.

Even stranger, using MIB Browser from the HostMonitor package, on the same system that HostMonitor is running on, with the same target IP and community setting, returns valid output. For example:

[1.3.6.1.4.1.789.1.29.1.1.7.4] = 7204600

What can cause such behavior?
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KS-Soft



Joined: 03 Apr 2002
Posts: 12117
Location: USA

PostPosted: Sun Nov 15, 2015 5:33 pm    Post subject: Reply with quote

Same community string but may be different SNMP version specified for the test?
SNMP v2 selected? Then try to use SNMP v1

Regards
Alex
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bmekler



Joined: 17 Apr 2012
Posts: 32

PostPosted: Sun Nov 15, 2015 9:50 pm    Post subject: Reply with quote

Trying to use v1 produces the following error:

-----------
SNMP Error: No such name.

Please note: You need to add ".0" to OID when you are checking single-instance counter.
Add index of the element to multi-instance counters (element of the table)
-----------

The counter I'm checking is a table element. Regardless, appending a .0 to the end gives a simple "SNMP Error: No such name" message.

I tried v3 as well; it returns a blank result just like v2.
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KS-Soft



Joined: 03 Apr 2002
Posts: 12117
Location: USA

PostPosted: Mon Nov 16, 2015 9:45 am    Post subject: Reply with quote

May we have SNMP access to your device?

Regards
Alex
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KS-Soft



Joined: 03 Apr 2002
Posts: 12117
Location: USA

PostPosted: Wed Nov 18, 2015 6:23 am    Post subject: Reply with quote

Somehow SNMP agent on this device does not work properly - it does not respond to SNMP Get requests (for counters below 1.3.6.1.4.1.789.1.29.1.1.1 branch).
While GetNext requests work fine. Perhaps NetApp developers know the answer?

Regards
Alex
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