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Added performance data output. Maybe you will alter the script?

--- check_disk_snmp.pl_2011-06-01_091729-536735145 2011-05-30 17:00:49.195836862 +0200
+++ check_disk_snmp.pl 2011-06-01 10:33:59.627838690 +0200
@@ -40,7 +40,10 @@
my $devUsed = q{}; ## - used oid
my $perc = 0; ## - device percent used
my $free = 0; ## - device free space
+my $used = 0; ## - device used space
my $size = 0; ## - device size
+my $size_warn = 0; ## - device warning size
+my $size_crit = 0; ## - device critical size
my %unit_t = ( ## - units table
'KB' => 1 {$devSize}) * 100);
$size = sprintf("%0.2f", $resp->{$devSize} / $unit_sz);
+$size_warn = sprintf("%0.2f", ($resp->{$devSize} / 100) * substr($warn,0,-1) / $unit_sz);
+$size_crit = sprintf("%0.2f", ($resp->{$devSize} / 100) * substr($crit,0,-1) / $unit_sz);
+$used = sprintf("%0.2f", $resp->{$devUsed} / $unit_sz);
$free = sprintf("%0.2f",
($resp->{$devSize} - $resp->{$devUsed}) / $unit_sz
);
@@ -334,8 +340,9 @@
if ($free >= 100) {$free = commify(int($free))}
if ($size >= 100) {$size = commify(int($size))}

-print "SNMP $state - ",
- "$resp->{$devDesc} at ${perc}% with $free of $size $unit_desc free\n";
+print "DISK $state - ",
+ "$resp->{$devDesc} at ${perc}% with $free of $size $unit_desc free",
+ " | disk_usage=$used$unit_desc;$size_warn;$size_crit;0;$size\n";

exit $ERRORS{$state};