Stian Jordet writes:
> tir, 13,.09.2005 kl. 22.38 -0700, skrev Craig Barratt:
> > Carl Wilhelm Soderstrom writes:
> >
> > > I'm running out of disk space on my backup server, and it's run out of
> > > space
> > > on a couple of occasions. when it does this, some hosts 'forget' all
> > > their old
> > > backups -- those backups no longer appear in the pc/<hostname>/backups
> > > file.
> > >
> > > I know the backups.old file has a copy of the last known-good backups
> > > file;
> > > but what happens if that one is bad as well? (Machine runs out of space,
> > > space is freed, a running backup is shut down, a bad backup file is
> > > written
> > > and clobbers the old backups.old file).
> > >
> > > I think this has been discussed on the list in the past; but can someone
> > > remind me how to rebuild a backups file based on the actual directories
> > > present?
> > >
> > > This is something that probably should be added to the docs.
> >
> > I need to write a script that does this for you. It could
> > also be done manually.
> >
> > Some information (eg: number of files backed up, total size)
> > takes more work to recreate since it requires the backed-up
> > tree to be traversed. But that information is only used for
> > stats/display, so it is not critical.
> >
> > Some information (eg: full vs incr) probably needs to extracted
> > from the per-PC LOG file.
> >
> > Some information (eg: existing count and size of files in pool) is
> > not easy to reconstruct, but again it only used for stats/display.
> >
> > Anyhow, this is something I should work on. Do you need a solution
> > quickly?
>
> I just blew a fuse trying to start up too many computers at once, and
> the battery on my UPS obviously isn't what it used to be anymore, so my
> server died. It might seem like it was doing some backup, because the
> backups file for three of my machines were empty. backups.old as well.
>
> So my question is, was this script ever written? I see that this is over
> a year ago now. If not, how can I easiest recover?
>
> To make things more complicated, a backup started of one computer before
> I found out that the backup files had been truncated. I had one backup 0
> from sometime last summer that now was overwritten. It doesn't really
> matter that the old backup is lost, except that I have about 25 backups
> for that machine, and 0 is the newest one. Should I just delete the 0
> directory before I recreate the backups file? (When I know how to :P)
>
> And sorry for bringing this old thread back to life.
In BackupPC 3.0.0 an additional copy of the per-backup information is
stored in each backup directory, which readily allows the backups file
to be re-created. Also, the writing of these files is now verified
by writing to a temp file, re-reading and checking the contents,
before replacing the original.
BackupPC 3.0.0 includes a recovery script BackupPC_fixupBackupSummary
that re-creates the backups file. It includes the -l option for
legacy mode that looks through the log files to recreate backup
files from 2.x.
Unfortunately BackupPC_fixupBackupSummary won't run without changes
on BackupPC 2.x since it depends on some new modules in BackupPC 3.0.0
(BackupPC::Storage).
You should be able (but I haven't confirmed) to install BackupPC 3.0.0
in a new directory (pointing it at the old data store) and just run
BackupPC_fixupBackupSummary -l HOST
Make sure you keep a copy of the main config.pl file so you
can revert back to it when you restart BackupPC 2.x.
Or you could actually upgrade to BackupPC 3.0.0, although I don't
recommend that right now since it's best not to change too many
things when you are trying to recover from a problem.
Craig
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