Re: [Dump-devel] Re: Dump through a named pipe (FIFO)

[Stelian P. <ste...@fr...>]

On Sun, Nov 17, 2002 at 11:30:56AM -0800, Chris de Vidal wrote:

> > > By the way, this:
> > > dump 0bdsf 64 100000 100000 - /tmp | ssh
> > user@remote
> > > "dd bs=64k of=test.dump"
> > > was already thought of.  Won't work with this
> > setup.
> > 
> > Why ? It should work and it is definately the
> > recommended way <snip>
> 
> And it has worked well for me in the past.
> 
> This setup, a web-based GUI backup, only allows me to
> execute a pre and post backup script.  The actual
> backup uses dump and can't be altered to also include
> ssh, so I had been testing out dumping through a FIFO.

Ok.

>   As I said, it _almost_ works.  I don't get it.
> 
> So, do you have an idea why dump hangs when the output
> file is a FIFO?  The file system is ext2 and kernel is
> 2.2.16.  I'd really appreciate it.
> 
> Do you suppose it matters that the FIFO is being
> copied over SSH?

Well, I just tried it here and it works correctly for me:
	mkfifo /tmp/FIFO
	dd bs=64k if=/tmp/FIFO | ssh user@host "dd bs=64k of=test.dump" &
	dump -0 -b 64 -f /tmp/FIFO /

What version of dump are you using ? If it is not the latest
one (0.4b32), please retry with it.

Also, it could be useful to run strace (using strace -f dump...),
it will show all open/read/write calls on the fifo, maybe this
will show what happens.

Stelian.
-- 
Stelian Pop <ste...@fr...>
Alcove - http://www.alcove.com