check_smart 6.17.0 fixes ATA error count and adds areca raid support for multi-device check

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

The newest release, 6.17.0, contains a fix and an enhancement from two individual open source contributors. Thanks a lot!

Fix ATA Error Count

Since version 6.15.0, the check_smart plugin also checks the "ATA Error Logs" on ATA drives by default, unless the option --skip-error-log is used.

Here's an example of such a broken disk showing the ATA Error Count (from smartctl output):

SMART Error Log Version: 1
ATA Error Count: 30 (device log contains only the most recent five errors)
    CR = Command Register [HEX]
    FR = Features Register [HEX]
    SC = Sector Count Register [HEX]
    SN = Sector Number Register [HEX]
    CL = Cylinder Low Register [HEX]
    CH = Cylinder High Register [HEX]
    DH = Device/Head Register [HEX]
    DC = Device Command Register [HEX]
    ER = Error register [HEX]
    ST = Status register [HEX]
Powered_Up_Time is measured from power on, and printed as
DDd+hh:mm:SS.sss where DD=days, hh=hours, mm=minutes,
SS=sec, and sss=millisec. It "wraps" after 49.710 days. 

However the added default check for ATA Error Count introduced a regression. The plugin also alerted, when the line was found but with a value of 0 (ATA Error Count: 0): 

$ /usr/bin/sudo /usr/lib/nagios/plugins/check_smart.pl -g '/dev/sd[a-d]' -i 'ata' -w 'Reallocated_Sector_Ct=4,Runtime_Bad_Block=4,Uncorrectable_Error_Cnt=2,Reallocated_Event_Count=2' --skip-self-assessment
WARNING: [/dev/sda] - [/dev/sda] - ata_errors is non-zero (0)[/dev/sda] -  --- [/dev/sdc] - [/dev/sdc] - ata_errors is non-zero (0)[/dev/sdc] -  --- [/dev/sdd] - [/dev/sdd] - ata_errors is non-zero (0)[/dev/sdd] -  --- [/dev/sdb] - Device is clean

Florian Sager discovered this problem and contributed a fix to make sure to skip the ATA Count Error line if the value is 0.

Added areca RAID devices for multi drive check

The next contribution comes from Philippe Beaumont and enhances the multi drive check (using the -g / --global) with devices behind an areca raid.

Here's a working example:

$ sudo /usr/lib/nagios/plugins/check_smart.pl -g /dev/sg1 -i "areca,[1-4]"
OK: [areca,1] - Device is clean --- [areca,2] - Device is clean --- [areca,3] - Device is clean --- [areca,4] - Device is clean|



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