[plug] Monitoring dd

Craig Foster fostware at iinet.net.au
Wed Sep 4 23:09:09 WST 2002


Try a local rsync or derivitives
(http://freshmeat.net/search/?q=rsync&section=projects) or even
something like unison (http://www.cis.upenn.edu/~bcpierce/unison/). Both
do incremental copies and some error checking, with rsync matching
internal md5sums to make sure the copy is OK. They both will also work
over a network, with rsync having it's own permissions system if you
want :)

IMHO rsync is pretty much 'it' for large disk to disk backups where
accuracy rules

Regards,

Craig F.

> -----Original Message-----
> From: Steege, Phil E [mailto:phil.e.steege at lmco.com] 
> Sent: Wednesday, September 04, 2002 9:42 PM
> To: PLUG
> Subject: [plug] Monitoring dd
>
> I bought a second 40gb drive because it was cheaper than buying a tape
> backup system.
> I backed up my linux drive (/dev/hda) using 'dd if=/dev/hda 
> of=/dev/hdb
> bs=512' and then plan to write a script to compare /dev/hda 
> for differences
> and nightly have a cron job copy the changed files over.
> 
> When I was doing the dd I wondered if there was a way to monitor the
> progress of the dd command, besides seeing the disk activity 
> light flashing?
> I wanted to be able to see how much had been copied during 
> the process.
> 
> Phil
> 
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