On Fri, 21 Jun 2013 06:49:40 -0400
Scott D <[email protected]> wrote:
> >
> Are you using the -d option for direct disk access? I have noticed
> slow downs like that, but using the direct disk access option seemed
> to take care of that and resulted in much faster reads.
I've tried with and without. Without -d seems to be faster at
this point.
Anyhow, I did a major hack job ( in the true spirit of *nix ;) ) and
created this little shell script to help me out;
-------------
RECOVERY_SIZE=1
while [ 1 -eq 1 ]; do
ddrescue -v -f -s ${RECOVERY_SIZE}M /dev/sdd data.img data.log
echo "Sleeping ..."
sleep 1
echo "Awake!"
RECOVERY_SIZE=$(($RECOVERY_SIZE + 1))
done
-------------
With this simple script, exploiting the strange behaviour where the
data rate usually has a burst at the start, I've gone from 13KByte/sec
average to closer to 51KByte/sec average. Doesn't sound like a massive
increase but that does mean I'll go from barely 1GB/day up to 4GB/day,
and thus this recovery process will actually be "doable" within a month.
Still would love to know the mechanism behind it all.
--
Computer Repairs for Charters towers - http://ctpc.biz
A.B.N. 19 500 721 806
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