After upgrading to Spectrum 24.3.7 we notice performance issues on a single landscape

Products

• Network Observability
• Spectrum

Issue/Introduction

We have a large DSS environment, but after upgrading to Spectrum 24.3.7, one of our landscapes suddenly has a performance issue where it becomes unusable.

We can see in the VNM.OUT / Spectrum Control Panel the following

 

May 13 15:31:55 WARNING at ItcQdItem.cc(387): Request 28180531 not accepted after 60000ms, cs delta=0
May 13 15:32:55 WARNING at ItcQdItem.cc(387): Request 28180532 not accepted after 60000ms, cs delta=0
May 13 15:33:55 WARNING at ItcQdItem.cc(387): Request 28180533 not accepted after 60000ms, cs delta=0
May 13 15:34:55 WARNING at ItcQdItem.cc(387): Request 28180534 not accepted after 60000ms, cs delta=0
May 13 15:35:55 WARNING at ItcQdItem.cc(387): Request 28180535 not accepted after 60000ms, cs delta=0

Environment

Spectrum 24.3.7 and higher

 

Cause

We have made some SNMPv3 improvements which generally offer better performance, however if a landscape processes a lot of SNMPv3 Traps, they may see performance issues.

Resolution

Please add the following lines to the $SPECROOT/SS/.vnmrc file and then stop and restart the SpectroSERVER.

 

fix_v3_profile_lock=false
failed_cache_for_unmanaged_trap=false