my @rrds = grep { /.*rrd$/ && -f "$logsdir/$_" } readdir DIR;
Why match zero or more characters in /.*rrd$/ when /rrd$/ would match the same thing with less work? Perhaps you meant /\.rrd$/?
$cmd = qq|$mv resize.rrd $logsdir/$rrd|;
print "\tRenaming resized file, executing $cmd\n";
system($cmd) == 0 or die "Could not execute $cmd:$!\n";
Why not just use Perl's built-in rename function?
print "\tRenaming resized file, executing $cmd\n";
rename 'resize.rrd', "$logsdir/$rrd" or die "Could not rename
+resize.rrd:$!\n";
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