Check manual page of multipath

State of Multipathing on Linux

Included in	All Checkmk editions
Source Code License	Open Source
Supported Agents	Linux

This check monitors the state of multipath devices on Linux hosts by comparing the number of active paths with the number of paths that was recorded when the service was discovered.

Without a rule, the check goes WARN if fewer paths are active than recorded, for example because a path is broken or has disappeared from the multipath output entirely. It also goes WARN if more paths than recorded are present. A rediscovery updates the recorded number.

With the ruleset "Linux and Solaris Multipath Count" you can instead configure an expected number of active paths, in which case the check goes CRIT if fewer paths are active and WARN if more, or lower levels for the percentage of active paths.

Paths that are listed but not active are named in the service output. If the device has no paths at all, the check goes CRIT.

This check is based on the output of the command multipath -l as sent by the Linux agent. It correctly deals with various subtle differences between the available versions of the multipath tools.

Item

The UUID of the multipath device, e.g. "360a980004334644d654a364469555a76". Via inventory_multipath_rules you can specify whether an alias should be used as item instead of the UUID. If the multipath device has an alias the alias will be used as item.

Discovery

One service is created for each multipath device. The number of paths at that time is recorded with the service.