On 01.04.01, 18:09:17, wojtek@wojtek.from.pl wrote:
> > > > something like this:
> > > > 
> > > > tar -c -v -f - -T /var/run/tapefilelist |
> > > >   ssh -c blowfish sysfoo buffer -m 4m -p 25 -B -o /dev/rst1 -t
> > > > 
> > > > This works, but is very slow and I can only fit about 3.2 GB on a 4 GB tape.
> > > > CPU load on both machines is less than 5% and net usage is about 500 K/s.
> > > 
> > > ssh uses lots of cpu for scrambling
> > 
> > Yes, but if CPU load is under 5% (95% idle), it doesn't explain the slow
> > speed.  I guess the DAT drive writes some data, then stops, rewinds the
> > tape, writes some more data etc.  But why?  I have a 4 MB buffer which should
> > be enough to keep the tape streaming, IMHO..
> 
> what blocks does "buffer" program use?
> 
> try setting blocks to 0 (mt setblk 0) and set 32kB output block size in
> "buffer". i do not use buffer no i don't know what's the options
> 

Also try to use the "buffer" program on both computers, not only on
the one with the tape drive.

-- 
Bernd Sieker

NetBSD: The Last Bastion of the true UNIX Religion.
		-- Miles Nordin