HP Hardware Monitoring and ILO Monitoring via SNMP

Last Modified

Tue Mar 10 19:40 GMT 2020

Description

  • SNMP Hardware Monitoring of HP ILO not finding OID during SNMP monitoring.
  • "SNMP Pass Through" does find both, but does not allow the OID for Physical Drive to be found via an SNMP walk.

Environment

  • N-able N-central 12.0+
  • HP Server in Gen8+
  • Integrated Lights-Out

Solution

  • Background Information
  1. Agentless Monitoring - Assumes that SNMP queries are being used to monitor the device.
  • This causes the probe discovery to detect a single device sharing one MAC address, but having two IP addresses, thus only finding a single device rather than Server plus ILO.
  • The OID for Physical Drive does show up on the ILO and is able to be monitored via SNMP, but must be done from the ILO or via custom SNMP service targeting the ILO.
  1. SNMP Pass-Through - Assumes that an agent might be used for monitoring and passes any SNMP queries directed at the ILO to the Server.
  • Both devices do show up as separate devices on probe discovery, but the OID for Physical Drive isn't able to be found at all, as it isn't present via Insights and the ILO just passes everything through to the Server Hardware.
  • The agent can pick up WMI details for the drives/partitions, but no OID for Physical Drive.
  • First Workaround/Solution option:
  1. Disable SNMP Pass-through in the ILO
  2. Delete the device from N-able N-central
  3. Run a new discovery job
  • In some cases this may not be possible, in which case we have a Second Workaround/Solution option:
  1. Collect all MAC Addresses associated to the Server.
  2. Find out the ILO MAC Address(es) by login into the ILO.
  3. At the Service Organization (SO),
    1. Administration > Defaults > Discovery Defaults
    2. Locate the section called MAC Addresses to Exclude
    3. Add *all* of the MAC Addresses from Steps 1 and 2 to the exclusion list.
    • Without all of the MAC addresses added there is a significant chance that the ILO and HP server will be mapped together during discovery.
  • In some cases it may be possible to find the MIB file from HP directly and install it on the server (after installing Insights) which should allow SNMP monitoring to work normally using Agentless Monitoring on the ILO.
  • Another alternative to work around the situation will be to Discover via SNMP Pass-Through to discover both devices separately, then import the Server itself and install an agent.
  • After the agent and services check in, switch to Agentless Monitoring on the ILO and use a custom SNMP service to look for the OID of the Physical Drive (ensure it shows up on a Get or Walk).