Can anyone explain following piece of code in https://github.com/simondeziel/custom-nagios-plugins/blob/master/plugins/check_megaraid_sas . (line num 220-223) Why this code is there
} elsif ( $slotnumber != 255 ) {
$pdbad++;
$status = 'CRITICAL';
}
It makes sense to look at the complete section:
PDISKS: while (<PDLIST>) {
if ( m/Slot Number\s*:\s*(\d+)/ ) {
$slotnumber = $1;
$pdcount++;
} elsif ( m/(\w+) Error Count\s*:\s*(\d+)/ ) {
if ( $1 eq 'Media') {
$mediaerrors += $2;
} else {
$othererrors += $2;
}
} elsif ( m/Predictive Failure Count\s*:\s*(\d+)/ ) {
$prederrors += $1;
} elsif ( m/Firmware state\s*:\s*(\w+)/ ) {
$fwstate = $1;
if ( $fwstate eq 'Hotspare' ) {
$hotsparecount++;
} elsif ( $fwstate eq 'Online' ) {
# Do nothing
} elsif ( $fwstate eq 'Unconfigured' ) {
# A drive not in anything, or a non drive device
$pdcount--;
} elsif ( $slotnumber != 255 ) {
$pdbad++;
$status = 'CRITICAL';
}
}
} #PDISKS
That section loops over a list of PDs (Primary Disks?), and I assume that this file / program output contains a human readable status for every attached device. The code looks at every line and performs some actions depending on the content of that line:
$slotnumber is assigned whenever there is Slot Number : ... in the contents of PDLIST. From looking at the logic, if there is a Firmware state line that is not Hotspare, Online or Unconfigured, and the $slotnumber is not 255, then something went horribly wrong and the status is considered CRITICAL. The number of bad PDs ($pdbad) is then increased by one.
