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  export srcdev=`rbd map rbd_ssd/vm-277-disk-0`; [ -z $srcdev ] && exi
+t 1   # eg: /dev/rbd47
  export dstdev=`rbd map rbd_ssd/vm-472-disk-0`; [ -z $dstdev ] && exi
+t 1   # eg: /dev/rbd48
...
      read STDIN,$a,16;if ($a eq $b) {print "s"} else {print "c" . $_}
+' $srcdev |
     perl -ne 'BEGIN{$/=\1} if ($_ eq"s") {$s++} else {if ($s) {
      seek STDOUT,$s*4194304,1; $s=0}; read ARGV,$buf,4194304; print $
+buf}' 1<> $dstdev;

  export remote='root@zajnb01-kvm5f.mirror.ad.company.co.za';
  export dstdev=`ssh -i /root/.ssh/rsync_rsa $remote "rbd map rbd_ssd/
+vm-277-disk-0`; [ -z $srcdev ] && exit 1";
...
  ssh -i /root/.ssh/rsync_rsa $remote "lzop -dc |
   perl -ne 'BEGIN{\$/=\1} if (\$_ eq\"s\") {\$s++} else {if (\$s) {
    seek STDOUT,\$s*4194304,1; \$s=0}; read ARGV,\$buf,4194304; print 
+\$buf}' 1<> $dstdev";