Re: [BackupPC-users] Problems with hardlink-based backups...
2009-08-31 23:37:42
Holger Parplies wrote at about 02:05:28 +0200 on Tuesday, September 1, 2009:
> Hi,
>
> Jeffrey J. Kosowsky wrote on 2009-08-31 18:15:07 -0400 [Re: [BackupPC-users]
> Problems with hardlink-based backups...]:
> > Les Mikesell wrote at about 15:23:41 -0500 on Monday, August 31, 2009:
> > > Jeffrey J. Kosowsky wrote:
> > > > [...]
> > > > I guess I can't answer your question without knowing what use cases
> > > > you are worried about.
> > >
> > > All of them.
Name the top 10 that worry you most so that I can get a feeling for
how hard they are to solve. Again, I can't address a generic fear.
>
> that is the point, precisely. You need to deal with *all of them*. Anything
> that can happen, whether you can anticipate it or not.
>
> > > Filesystems have journal/check mechanisms. How would you
> > > provide the equivalent?
> >
> > I am certainly not a database expert but I am aware enough to know
> > that such integrity issues are dealt with all the time in real world
> > databases
>
> Wrong. That is what you are missing. We're not talking about in-database
> corruption, we're dealing with inconsistencies on the application level. The
> database and its related tools don't know anything about the *meaning* of the
> data BackupPC puts inside the database. You can't have a
>
> FOREIGN KEY (filename) REFERENCES external-file-path ON DELETE RESTRICT
>
> (i.e. as long as something references the file, the file system may not
> delete
> it). Do you understand that?
Well you simply don't include anything in BackupPC that would delete a
file before checking that there are no active references in the
database. In fact, I believe that BackupPC only ever deletes or even
renames pool files during the BackupPC_Nightly run. So, the new
version of BackupPC_Nightly would have to check the database before
deleting files which is how you would want to do it anyway to identify
orphan files. I fail to see why this is that so complicated?
And if you are worried about programs other than BackupPC deleting the
file then the same can occur today since I could go into topdir and
start creating all types of havoc by overwriting pool files or
deleting attrib files.
>
> > I am only suggesting that the current implementation seems to be difficult
> > to extend to address other relatively common and standard backup
> > requirements.
>
> Fair enough, and agreed.
>
> > Let's all keep an open mind, especially since we are all far from
> > committing
> > development resources to any path.
>
> Discussions in this length *are* development resources.
>
You are free to ignore this thread...
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- Re: [BackupPC-users] Problems with hardlink-based backups..., (continued)
- Re: [BackupPC-users] Problems with hardlink-based backups..., Jim Leonard
- Re: [BackupPC-users] Problems with hardlink-based backups..., Jeffrey J. Kosowsky
- Re: [BackupPC-users] Problems with hardlink-based backups..., Les Mikesell
- Re: [BackupPC-users] Problems with hardlink-based backups..., Jeffrey J. Kosowsky
- Re: [BackupPC-users] Problems with hardlink-based backups..., Holger Parplies
- Re: [BackupPC-users] Problems with hardlink-based backups...,
Jeffrey J. Kosowsky <=
- Re: [BackupPC-users] Problems with hardlink-based backups..., Jeffrey J. Kosowsky
- Re: [BackupPC-users] Problems with hardlink-based backups..., Jeffrey J. Kosowsky
- Re: [BackupPC-users] Problems with hardlink-based backups..., Michael Stowe
- Re: [BackupPC-users] Problems with hardlink-based backups..., Jeffrey J. Kosowsky
- Re: [BackupPC-users] Problems with hardlink-based backups..., Jim Leonard
- Re: [BackupPC-users] Problems with hardlink-based backups..., Jeffrey J. Kosowsky
- Re: [BackupPC-users] Problems with hardlink-based backups..., Jim Leonard
- Re: [BackupPC-users] Problems with hardlink-based backups..., Michael Stowe
Re: [BackupPC-users] Problems with hardlink-based backups..., Jeffrey J. Kosowsky
Re: [BackupPC-users] Problems with hardlink-based backups..., Michael Stowe
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