Cordialement

Jean-Sébastien Hederer - Gérant ASPerience
Conseil, intégration, hébergement de systèmes informatiques 
spécialisé en solutions logiciel libre de gestion d'entreprise
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Michael Winiberg wrote:
  

Hi,

I realise this has probably been discussed before, but I am wondering 
whether there is yet any
Way to cope with a dropped connection part way through a backup? I am 
backing up some remote machines with bacula 2.2.8 (to disk, not tape). 
I've reduced the stuff to be backed up to the absolute minimum, but it 
still comes to about 4Gb for a full backup (which takes about 24 hours 
over a 512K link). However, as it is rare for the link to stay up for 
that long, I regularly get 3.999999999Gb failed backups. Some questions 
therefore arise:

1. Is it possible to access the files that were backed up before the 
link failed? I can't seem to find a way to do so, but the disk space is 
certainly occupied! This is also annoying because, even though the full 
backup failed, the next series of incremental backups runs as normal, ie 
bacula doesn't seem to realise that there isn't a full backup in the 
catalogue, until you try to restore something of course! The catalogue 
reports the number of files and space taken by the failed job, but won't 
allow you to list or restore them.

2. Is there any way to resume a backup from where it left off (or is 
there likely to be?) From my point of view it would be quite acceptable 
to have an option to suspend all backup activity until the link could be 
re-established so that there was no problem with files getting 
intermixed. Alternatively one could store the current state of the 
backup at the client end, add all files successfully transferred so far 
to the catalogue (to save wasting the effort expended so far) and then 
get the client to restart with the file in which the link was lost once 
the link is re-established. Doing it that way would allow recovery even 
with concurrent backups running. I'm willing to provide some programming 
resource towards doing this if you think it's practical in view of the 
way bacula works internally.

Sorry if I'm reopening a debate or have missed something obvious in the 
most recent release, but this seems to me to be a major failing in this 
otherwise excellent system and I'm willing to help do something about it 
if thought practical...
    

There presently is not a way to do this. What you could do, I suppose,
is transferring a tar or something like that via other, resumable, means
and then backing that up locally on the machine. There are a lot of ways
to skin that cat.

Note though that no backup system that I know of supports resuming
backups. I know HP's Storage Data Protector/OmniBack did not the last
time I used it (which was not that long ago).

- --
 ---- _  _ _  _ ___  _  _  _
 |Y#| |  | |\/| |  \ |\ |  | |Ryan Novosielski - Systems Programmer II
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 \__/ Univ. of Med. and Dent.|IST/AST - NJMS Medical Science Bldg - C630
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