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

[<jar...@ig...>]

On 18 Nov, Stelian Pop wrote:
> 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 /
> 

I don't understand what's the FIFO for.

What about  dump -0 -b 64 -f - | ssh user@host "cat >test.dump"

-- 
Helmut Jarausch

Lehrstuhl fuer Numerische Mathematik
Aachen University
D 52056 Aachen, Germany