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

[Nathan Straz <nstraz@xxxxxxx>]

On Thu, Sep 25, 2003 at 05:20:23PM +0200, Christoph Klocker wrote:
> then I did the benchmark how they were described in the man page I found on
> the web.
> [root@localhost lmdd]# ./lmdd if=internal of=/raid/XXX count=1000 fsync=1
> 8.1920 MB in 2.2116 secs, 3.7041 MB/sec
> 
> unmounted and mounted again
> [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."

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