Re: bash script: move large LV to another machine

On Fri, 2011-09-16 at 11:43 -0600, Ed Heron wrote:
> ... I'm going
> to change my script to create a temp file, copy the file and dd the
> piece.  ...

  My script appears to work...

--------------------
src_dev='/dev/vg/lv'
dst_addr='192.168.2.2'
dst_dev='/dev/vg/lv'
src_size=3200

src_blk=0
while [ $src_blk -lt $src_size ]
 do
  echo -n " $src_blk"
  src_md5=`dd if=$src_dev bs=32M skip=$src_blk count=1 2>/dev/null |
md5sum`
  dst_md5=`ssh $dst_addr "dd if=$dst_dev bs=32M skip=$src_blk count=1
2>/dev/null | md5sum"`
  if [ "$src_md5" == "$dst_md5" ]
   then
    echo -n "+"
    let src_blk=src_blk+1
   else
    echo -n "-"
    dd if=$src_dev of=vd-sync.tmp bs=32M skip=$src_blk count=1
2>/dev/null
    scp vd-sync.tmp ${dst_addr}:. >/dev/null
    ssh $dst_addr "dd conv=notrunc,fdatasync if=vd-sync.tmp of=$dst_dev
bs=32M seek=$src_blk count=1"
  fi
done
----------

  I'm very annoyed that creating a temp file works but piping the read
dd to the write dd doesn't.  Obviously, my knowledge has a hole in it.


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