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2 votes
Current Version
Last Release Date
FileDescription vs 0.4.1
TEST_check-multipath.plCheck output against expected results vs. 0.4.1
Monitor number of available connection paths per LUN and failed paths for multipath devices on Linux.
Some users wanted different configurations for single LUNs or groups of LUNs, so the optional parameters --extraconfig and --group were introduced.
A configuration for a specific LUN name via --extraconfig has highest priority and overrides group and global config.
If no --extraconfig entry matches and a regex defined in --group matches a LUN line, the specified group values are used. (First matching regex in List, checked from left to right.)
Otherwise the global defaults are used (--min-paths, --ok-paths).

The plugin performs an extra check for a running multipathd process.

-m, --min-paths Low mark, less paths per LUN are CRITICAL [2]
-o, --ok-paths High mark, less paths per LUN raise WARNING [4]
-n, --no-multipath Exitcode for no LUNs, no multipath driver and multipathd not running [warning]
-M, --mdskip Skip extra check for a running multipathd process (check uses '--no-multipath' returncode)

-L, --ll use multipath -ll instead of multipath -l
Can give more detailed information, helps to detect failed paths with older versions of multipath tools (RHEL 5, ...)

-r, --reload force devmap reload if status is WARNING or CRITICAL
(multipath -r)
Can help to pick up LUNs coming back to life.

-g, --group Specify perl-regex to identify groups of LUNs with other default-thresholds.
Overrides global config for LUNs with LUN lines that math a group regex.
In most cases a simple String should be sufficient. NOTE: special regex characters must be escaped!
"LUN_LINE_REGEX,LOW,HIGH:" for each group with deviant thresholds
e.g. "IBM,ServeRAID,1,1:ChpRAID,1,2:"
Use command multipath -l to see the LUN lines and to identify groups.

-e, --extraconfig Specify different low/high thresholds for LUNs
Overrides group and global config for the specified LUNs.
optional: specify return code if no data for LUN name was found
(ok, warning, critical), default is warning
"LUN,LOW,HIGH[,RETURNCODE]:" for each LUN with deviant thresholds
e.g. "iscsi_lun_01,2,2:dummyLun,1,1,ok:paranoid_lun,8,16,critical:"
Use option -v to see LUN names used by this plugin.

-l, --linebreak define end-of-line string:
REG regular UNIX-Newline
HTML br-Tag (HTML-Linebreak)
-other- use specified string as linebreak symbol, e.g. ', ' (all in one line, comma seperated)

-s, --state Prefix alerts with alert state
-S, --short-state Prefix alerts with alert state abbreviated
-h, --help Display this help text
-V, --version Display version info
-v, --verbose

-d, --di Run testcase instead of real check [0]
-t, --test Do not display testcase input, just result

System configuration for 'sudo' must allow the Nagios user to call the command 'multipath -l' and/or 'multipath -ll' if you use the --ll option (and also 'multipath -r' if you intend to use the --reload option) *without* password.

Several testcases to are included in the script. They can be called by using the parameter --di with numerical values other than zero.
The additional Script '' can be used for regression tests if you feel like editing the plugin.

This plugin was written by Hinnerk Rümenapf and is based on work by:
- Trond H. Amundsen []
- Gunther Schlegel []
- Matija Nalis []

Thanks to Bernd Zeimetz, Sven Anders, Kai Groshert, Ernest Beinrohr, Sébastien Maury, Benjamin von Mossner, Michal Svamberg, Andreas Steinel and Ben Evans for testing and contributions and to Matthew Castanien, Dmitry Sakoun, Robert Towster, Tom Schier and Ricardo Guijt for their comments.