Re: Dealing with a very large file -1,5TB

[Nathan Straz <nstraz@xxxxxxx>]

On Thu, Sep 25, 2003 at 12:52:20PM -0500, Steve Lord wrote:
> On Thu, 2003-09-25 at 11:16, Nathan Straz wrote:
> > On Thu, Sep 25, 2003 at 05:20:23PM +0200, Christoph Klocker wrote:
> > > [root@localhost lmdd]# ./lmdd if=/raid/XXX of=internal
> > > 8.1920 MB in 0.0776 secs, 105.6065 MB/sec
> > > 
> > > the 105 MB/s seem to be very slow, 
> > 
> > I find that you really have to increase the block size you're using for
> > I/O.  Try adding "bs=1024" or similar to your command lines.  Also try
> > "odirect=1."
> 
> bs=128k or some other larger value might be more meaningful.

Doh!  I forgot the "k".  I find that block sizes in the 1-4MB range get
my the most throughput usually.

-- 
Nate Straz                                              nstraz@xxxxxxx
sgi, inc                                           http://www.sgi.com/
Linux Test Project                                  http://ltp.sf.net/