increasing dd disk to disk transfer rate

[Dmitry Morozovsky]

On Fri, 13 Jan 2006, Peter Jeremy wrote:

PJ> >The process is running now since yesterday evening and it is at 53 MB
PJ> >at a transfer rate of about 1.1 MB/s.
PJ> >
PJ> >In case the the result being unusable I would like to find a way to make this
PJ> >copying faster.
PJ> 
PJ> Note that whilst increasing the DD blocksize will speed up the
PJ> transfer, it will also increase the amount of collateral damage when a
PJ> hard error occurs.  If you rummage around the ports or tools tree,
PJ> you'll find a utility (its name escapes me but I believe it was
PJ> written by phk) that is designed to do disk-to-disk recovery - it
PJ> copys data in big slabs until it gets an error and then works around
PJ> the faulty area block by block.
PJ> 
PJ> You should also install /usr/ports/sysutils/smartmontools - this
PJ> handles S.M.A.R.T.

I would suggest also using src/tools/tools/recoverdisk by phk (I still not sure 
why it's not a port)

Sincerely,
D.Marck                                     [DM5020, MCK-RIPE, DM3-RIPN]
------------------------------------------------------------------------
*** Dmitry Morozovsky --- D.Marck --- Wild Woozle --- marck at rinet.ru ***
------------------------------------------------------------------------