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Special Forums UNIX and Linux Applications Infrastructure Monitoring Can HPOV monitor server hung state ? Post 303036448 by Neo on Wednesday 26th of June 2019 09:58:41 PM
Old 06-26-2019
HPOV like most centralized network management systems (NMS) rely primarily on polling to update their management system.

This means you cannot get information by polling an unresponsive server.

However, most of these same systems also can be configured to send traps.

This means, your HPOV team needs to set up your system to send traps back to the management system before the system being monitored slows to a crawl (soft failure) and cannot respond to polling,

In other words, most novices set up network management systems like HPOV to use only polling; but experienced network management people will also set up traps to be sent back to the NMS for certain critical processes which need to alert the NMS prior to overall system "failure" (also meaning a soft failure, not only a hard failure).

I have extensive hands-on experience in NMS including debugging HPOV when it was a black and white versus decades ago. All well configured NMS will be configured to poll (95% +) and to trap (< 5%) alerts.

Bottom Line: Set up traps for the critical processes to alert the NMS before the system soft-fails (slows to a crawl).

Hope this helps.

Cheers.
 

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NETSNMP_TRAP_API(3)						     Net-SNMP						       NETSNMP_TRAP_API(3)

NAME
send_easy_trap, send_trap_vars, send_v2trap - send TRAPs or INFORMs from a Net-SNMP MIB module SYNOPSIS
#include <net-snmp/agent/agent_trap.h> void send_easy_trap(int trap, int specific); void send_trap_vars(int trap, int specific, struct variable_list *vars); void send_v2trap(struct variable_list *vars); DESCRIPTION
These three routines may be used to send traps from a MIB module within the Net-SNMP agent (including an AgentX subagent). send_easy_trap() sends an SNMPv1 trap (or the SNMPv2 equivalent) to the list of configured trap destinations (or "sinks"), using the pro- vided values for the generic trap type, and specific trap value. send_trap_vars() is similar, but appends the supplied list of variable bindings to the traps that are sent. send_v2trap() uses the supplied list of variable bindings to form an SNMPv2 trap, which is sent to SNMPv2-capable sinks on the configured list. An equivalent INFORM is sent to the configuredq list of inform sinks. Sinks that can only handle SNMPv1 traps are skipped. The various "send_trap()" calls allow you to specify traps in different formats. And the various "trapsink" directives allow you to spec- ify destinations to receive different formats. But *all* traps are sent to *all* destinations, regardless of how they were specified. I.e. it's ___ trapsink / send_easy_trap ___ [ Trap ] ____ trap2sink ___ [ Generator ] send_v2trap / [ ] ----- informsink ____ trapsess *Not* send_easy_trap -------------------> trapsink send_v2trap -------------------> trap2sink ???? -------------------> informsink ???? -------------------> trapsess WARNINGS
These routines are used to send the traps immediately they are called. Invoking them at the appropriate time is left to the MIB module programmer. SEE ALSO
snmpd.conf(5), snmptrapd(8) V5.6.2.1 13 Aug 2010 NETSNMP_TRAP_API(3)
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