Re: [Dump-users] Quick File Access support - howto

[Stelian P. <st...@po...>]

Le mardi 04 décembre 2007 à 12:54 +0100, Helmut Jarausch a écrit :
> Hi,
> 
> does anybody know (Stelian, you are supposed to) how the
> Quick File Access support does work?
> I thought it would notice the position (got by ftell or counting
> the output bytes) where
> a given file is stored on the backup medium.

It does work by using ioctl(MTIOCPOS) if the output is a tape, or lseek
if the output is a file.

> Therefore I tried something like
> 
> dump -y -b256 -0 -D /usr/src/dumpdates \
>       -Q /usr/src/$User-$Date.Q \
>       -L $Date-$User -f -  /home | \
>       /usr/local/bin/ttcp -t -l 262144 -p 5618 $Server"
> 
> Here ttcp is something similar to netcat.
> 
> Unfortunately dump fails
>   DUMP: [26581] error: 29 (getting tapepos: -1)

29 is ESPIPE: a pipe is not seekable. This is why it fails.

-- 
Stelian Pop <st...@po...>