check_smart monitoring plugin 6.18.3 released

Written by Claudio Kuenzler - 0 comments

Published on August 18th 2026 - Listed in Monitoring Hardware Icinga Nagios

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A new version of check_smart, a monitoring plugin to monitor hard drives (HDD), solid state drives (SSD) and NVMe drives, is available.

The newest release, 6.18.3, is a bugfix release and fixes or improves a couple of things.

Double-digit /dev/bus/NN devices

In certain situations your server might show multiple devices under /dev/bus, they'd appear as /dev/bus/1, /dev/bus/2 and so on. When there are many devices, the path could well result in double-digit bus devices - for example /dev/bus/13. 

Prior to 6.18.3, only one digit was supported in the regular expression. This has fixed now.

This bug was reported by Michael Metz and Stefan Neufeind. 

Improved exit code handling and catch smartctl errors

Another fix is a well improved exit code handling inside check_smart in general. There could be situations, especially when using the -g parameter for multi-device checks, that a previously CRITICAL status would be overridden by another device returning a WARNING state. 

Take this as an idea: Device 1 -> OK, Device 2 -> CRITICAL, Device 3 -> OK, Device 4 -> WARNING. In this situation, the plugin would return WARNING but should return the highest status (CRITICAL). 

Since 6.18.3 this is now clearly defined, so there's no "status downgrade" happening anymore.

Furthermore the pull request from Arkadiusz Miskiewicz also improves the signal handling from smartctl.

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