[GRLUG] External drive transfer rates

[Bob Kline]

On 10/20/07, Bob Kline <bob.kline at gmail.com> wrote:
>
>
>
> On 10/20/07, Michael Mol <mikemol at gmail.com> wrote:
> >
> > On 10/20/07, Bob Kline <bob.kline at gmail.com> wrote:
> > > I run two versions of Linux.  Kubuntu
> > > 7.04,  and a recent version of Mandriva.
> > >
> > > I recently acquired an external hard drive
> > > housing, which takes IDE drives,  and has
> > > a USB 2 interface.
> > >
> > > When I use it I mount it using the command
> > >
> > > mount -t ext3  /dev/X  /disk2
> > >
> > > and then proceed to transfer files.
> >
> > [snipped]
> >
> > > Looking around online,  it's clear this is a
> > > widespread problem.  The only solid lead I've
> > > seen is to somehow suppress the "sync"
> > > function,  which does seem to be standard.
> > > It's clear how to do this using /etc/fstab,  but
> > > as shown above,  I don't use that for now.
> > >
> > > Does anyone have any tips or suggestions?
> > > While the transfers are robust,  and in a
> > > sense everything is working,  the rates are
> > > almost too slow to be of interest.
> >
> > How about:
> >
> > mount -t ext3 -o async  /dev/X  /disk2
>
>
> That would seem to make sense, but the
> man page for mount suggests that the
> default is async.
>
> One can use
>
> mount -t ext3  -o defaults /dev/X  /disk2
>
> but its unclear why this is useful.  I'm
> assuming that one doesn't need it, but
> will try it just to be sure.
>
> More later.
>
> Thanks.
>
>      -Bob
>

The async option is apparently the default,
and has no affect on the slow transfer rates
I'm seeing.

Some have wondered whether the connection
is somehow defaulting to a USB 1.1 mode.  But
if so, I see no way to do anything about that.

   -Bob
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