clonehdd followup

[Erich Dollansky]

Hi,

On Fri, 17 Jan 2014 19:36:19 -0700 (MST)
Warren Block <wblock at wonkity.com> wrote:

> On Fri, 17 Jan 2014, paul beard wrote:
> 
> > Grr. The return key should not be the same as Send.
> >
> > I had some problems with clonehdd that turned out to be hardware
> > issued: my disks has somehow defaulted to PIO4 from UDMA which made
> > this process run so slow it would just quit with finishing.
> >
> > Now things are more what I expect, completing a clone of my root
> > disk in 524 minutes, down from multiple days?
> >
> > But it still seems slow if the disks are 1.5Gb/sec SATA disks.
> > Looking around, it looks like this might be useful to speed things
> > up.
> >
> >
> > http://www.wonkity.com/~wblock/docs/html/disksetup.html
> 
> How?  The partitioning scheme does not make any serious difference to 
> transfer rates.  That's much more affected by the filesystem, but
> even there the limits are usually due to drive and controller
> hardware.
> 
> One thing the partitioning scheme can affect is alignment.  In your 
> other mail, this was shown to be a 500G drive, which is almost
> certainly not using 4K blocks, and so alignment is not a problem.

I have several 500GB drive which use 4k sectors.

Erich