#!/bin/bash

: '
lsscsi -g
[0:0:0:0]    tape    IBM      ULT3580-HH5      BBNF  /dev/st0   /dev/sg8 
[0:0:0:1]    mediumx IBM      3573-TL          B.20  /dev/sch0  /dev/sg9 
[0:0:1:0]    tape    IBM      ULT3580-HH5      BBNF  /dev/st1   /dev/sg10

mtx -f /dev/sg9 status 
  Storage Changer /dev/sg9:2 Drives, 48 Slots ( 3 Import/Export )
Data Transfer Element 0:Empty
Data Transfer Element 1:Empty
      Storage Element 1:Full :VolumeTag=000001L5                        
      Storage Element 2:Full :VolumeTag=000002L5                        
      Storage Element 3:Full :VolumeTag=000003L5                        
      Storage Element 4:Full :VolumeTag=000004L5                        
      Storage Element 5:Full :VolumeTag=000005L5                        
      Storage Element 6:Full :VolumeTag=000006L5                        
      Storage Element 7:Full :VolumeTag=000007L5                        
      Storage Element 8:Full :VolumeTag=000008L5                        
      Storage Element 9:Full :VolumeTag=000009L5                        
      Storage Element 10:Full :VolumeTag=000010L5                        
      Storage Element 11:Full :VolumeTag=000011L5                        
      Storage Element 12:Full :VolumeTag=000012L5                        
      Storage Element 13:Full :VolumeTag=000013L5                        
      Storage Element 14:Full :VolumeTag=000014L5                        
      Storage Element 15:Full :VolumeTag=000015L5                        
      Storage Element 16:Full :VolumeTag=000016L5                        
      Storage Element 17:Full :VolumeTag=000017L5                        
      Storage Element 18:Full :VolumeTag=000018L5                        
      Storage Element 19:Full :VolumeTag=000019L5                        
      Storage Element 20:Full :VolumeTag=000020L5                        
      Storage Element 21:Full :VolumeTag=000045L5                        
      Storage Element 22:Full :VolumeTag=000022L5                        
      Storage Element 23:Full :VolumeTag=000023L5                        
      Storage Element 24:Full :VolumeTag=000024L5                        
      Storage Element 25:Full :VolumeTag=000025L5                        
      Storage Element 26:Full :VolumeTag=000026L5                        
      Storage Element 27:Full :VolumeTag=000027L5                        
      Storage Element 28:Full :VolumeTag=000028L5                        
      Storage Element 29:Full :VolumeTag=000029L5                        
      Storage Element 30:Full :VolumeTag=000030L5                        
      Storage Element 31:Full :VolumeTag=000031L5                        
      Storage Element 32:Full :VolumeTag=000046L5                        
      Storage Element 33:Full :VolumeTag=000033L5                        
      Storage Element 34:Full :VolumeTag=000034L5                        
      Storage Element 35:Full :VolumeTag=000035L5                        
      Storage Element 36:Full :VolumeTag=000036L5                        
      Storage Element 37:Full :VolumeTag=000037L5                        
      Storage Element 38:Full :VolumeTag=000038L5                        
      Storage Element 39:Full :VolumeTag=000039L5                        
      Storage Element 40:Full :VolumeTag=000040L5                        
      Storage Element 41:Full :VolumeTag=000041L5                        
      Storage Element 42:Full :VolumeTag=000042L5                        
      Storage Element 43:Full :VolumeTag=000043L5                        
      Storage Element 44:Full :VolumeTag=000044L5                        
      Storage Element 45:Full :VolumeTag=CLNU00L1                        
      Storage Element 46 IMPORT/EXPORT:Empty
      Storage Element 47 IMPORT/EXPORT:Empty
      Storage Element 48 IMPORT/EXPORT:Empty
'

logfile=/home/thierry/$0.log
 rm $logfile

echo "start Erase Script @ $(date)" >> $logfile

i="1"
while [ $i -lt 44 ]
do
echo "---------------------------------------------------------------" >> $logfile
 echo "load and erase tape's  $i & $[$i+1] "$(date) >> $logfile
 mtx -f /dev/sg9 load $i "0" >> $logfile
 mtx -f /dev/sg9 load $[$i+1] 1 >> $logfile
 
 echo "erase drive0 tape $i" >> $logfile
 mt -f /dev/st0 erase >> $logfile &
 echo "erase drive0 tape $[$i+1]" >> $logfile
 mt -f /dev/st1 erase >> $logfile
 
 wait 
 
 mtx -f /dev/sg9 unload $i "0" >> $logfile
 mtx -f /dev/sg9 unload $[$i+1] 1  >> $logfile
 i=$[$i+2]
done
 
 echo "done Erasing 44 tapes script @ $(date)" >> $logfile

exit