Good script, but I had to change line 164 to be able to send the perfdata to graphite:
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$perfdata=sprintf("read_mbsec=%.2f write_mbsec=%.2f read_iosec=%.2f write_iosec=%.2f Total_iosec=%.2f",$IONReadMBsec,$IONWrittenMBsec,$IOReadssec,$IOWritessec,$dskIOTotal);
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