Linux is monitored via the OS agent
If it is being monitored under virtualisation technologies such as VMware, Proxmox, IBM Power Systems, RHV, oVirt, OLVM or Nutanix, then the Linux OS agent data is mapped to the virtual machine (VM).

OS agent metrics and features

• OS CPU usage of user/sys/IO wait/idle in %
• CPU queue: load average, blocked processes
• Memory usage of used/FS cache/free memory in MB
• Paging rate in MB/sec
• Paging space usage in %
• SAN (FC adapters ) throughput per adapter
  • data in MB/sec
  • IO/sec
  • response time (latency)
  • error
• LAN (ethernet) throughput per adapter
  • data in MB/sec
  • packet count
  • error
• Total IO throughput (Linux)
  • IOPS
  • Data in MB/sec
  • response time (latency)
• Filesystem capacity usage
• SAN multipath monitoring
• JOB TOP, CPU and Memory tracking of running processes visually over time
• ZFS cfg & performance
• NFS performance
• Filesystem usage
• Error log
• Logical Volume Manager
• CPU/IO/Mem pressure
• NVIDIA GPU
• Process list snapshot

Operating systems

• Linux on Power
• Linux x86
• Linux ARM

Implementation

There is XorMon daemon listening on the host where XorMon server is running on port 8162.
Each LPAR has an agent installed. This agent collect every minute data and saves it into a temporary file.
The agent contacts the XorMon server randomly every 10-20 minutes and sends all locally stored data for that period.
There are 2 agents, new XorMon agent (preferable one) which being further developed and older LPAR2RRD agent.

Agent prerequisites

• It may run under any user account, it does not need any special privileges in the OS.
• Opened TCP communication between each LPAR and XorMon server on port 8162.
• Connections are initiated from the agent side only.

Examples

Latency:

JOB CPU:

Topology:

Metric list

Last updated: 2026-10-21