Re: [LAD] [OT] bash vs disk activity

Hi,

On Tue, Oct 09, 2007 at 01:11:38PM +0200, Lars Luthman wrote:
> On Tue, 2007-10-09 at 14:02 +0300, Sampo Savolainen wrote:
> > Quoting Patrick Shirkey <pshirkey@email-addr-hidden>:
> >
> > > For example if I transfer 200mb to a usb disk the copy command takes
> > > about 30 seconds before it returns and the data takes about 5 minutes
> > > before it is actually finished being transferred and the device is
> > > unmountable.
> >
> > quick-hack(tm)
> >
> > (cp -a /xxx /usb_device && sync) &
> >
> > But remember sync flushes _everything_.
>
> Slightly-slower-hack: add the 'sync' option to whatever script or config
> file is used to mount the device (/etc/fstab, udev rules, KDE service
> menu etc). That way all writes will be synchronised automatically.

It sounds like this doesn't matter much for you, but keep in mind that -o sync
doesn't cause reads to be unbuffered, so don't go trying to benchmark your flash
devices that way!

-Forest

-- 
Forest Bond
http://www.alittletooquiet.net

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