script to disable power management on specific drives

#!/bin/sh

echo "::walk sd_state | ::grep '.!=0' | ::print -at struct sd_lun" |
        mdb -k|egrep "( struct sd_lun | struct scsi_device | un_f_power_condition_disabled )" |

( while read sd_lun && read scsi_device && read power_cond; do

        echo
        echo "=============================="
        echo

        sd_lun="0x"${sd_lun%% *}
        echo "LUN addr = " $sd_lun

        scsi_device=${scsi_device##*un_sd = }
        echo "DEV addr = " $scsi_device

        power_cond=${power_cond%%.*}
        echo "PWR addr = " $power_cond

        scsi_inq=`echo "$scsi_device ::print -at struct scsi_device" | mdb -k |grep "struct scsi_inquiry"`
        scsi_inq=${scsi_inq##*sd_inq = }
        echo "INQ addr = $scsi_inq"

        dev=`echo "$scsi_inq ::print -at struct scsi_inquiry" |
                mdb -k|egrep "(inq_vid|inq_pid|inq_revision|inq_serial)" |
                awk -F\" '{print $2}'`
        dev=""$dev
        echo $dev

        if [ `echo $dev | egrep "ST2000NM0001" |wc -l` -ne "1" ]; then
                continue
        fi

        echo "$sd_lun ::print -at struct sd_lun" | mdb -k| grep $power_cond

        byte=`echo "$power_cond/V" | mdb -k | awk '{print $2}'`
        echo "BYTE = $byte"
        byte=$((byte|64))
        byte=$((byte&127))
        echo "CHANGE TO $byte"

        echo "$power_cond/v 0t$byte" | mdb -kw > /dev/null

        echo "$sd_lun ::print -at struct sd_lun" | mdb -k| grep $power_cond
        byte=`echo "$power_cond/V" | mdb -k | awk '{print $2}'`
        echo "BYTE = $byte"
done )