Apologies if I'm hijacking this thread, but there's two things I don't
understand...
Firstly, what is the difference between running nightly manually vs it being
run by the daemon? It performs the same tasks either way, no? So, shouldn't
the inverse be true as well? In other words, if it's not safe to run nightly
manually, wouldn't it also be unsafe being run by the daemon? What makes it
safe for the daemon to run it?
Secondly, if it's always been a terrible idea to do so, how did the idea get
started to run it manually in the first place, and why is it so pervasive?
Thanks,
--Mark
-----Original Message-----
From: backuppc-users-bounces AT lists.sourceforge DOT net
[mailto:backuppc-users-bounces AT lists.sourceforge DOT net] On Behalf Of
Holger Parplies
Sent: Tuesday, June 02, 2015 1:31 PM
To: Random; kmwatters AT proobject DOT com
Subject: Re: [BackupPC-users] BackupPC Archive Failing
Hi,
Random wrote on 2015-06-02 05:13:36 -0700 [[BackupPC-users] BackupPC Archive
Failing]:
> [...] The previous issue turned out to be the main filesystem filling up.
I thought I was joking when I suggested that ...
> [...] The cpool is filling up and the nightly clean hasn't been
> clearing up any space.. for the last couple of weeks at least. How do
> I get the nightly process to start cleaning the cpool again?
Well, reduce the amount of data stored in your backups (meaning all of them,
not just the new ones; how to do that is a completely different topic).
Due to BackupPC's pooling mechanism and typical data usage patterns, removing
old backups (e.g. by automatic expiration done by BackupPC) tends to free far
less space than you might expect. New backups only take as much space as you
have new content not already found in the pool (i.e. copying or renaming a file
won't take any new space, changing one byte of an existing file will create a
new copy in the pool, if you don't happen to have an identical file somewhere
else already).
Conversely, deleting old backups only gives you back space for content you no
longer have *anywhere*. After deleting a file (or changing one), you will have
to wait until *all backups* that include the old version of the file have
expired before you get anything [much] back. There is a *slight* amount of
metadata per backup, but even that is pooled, so you won't get anything back
e.g. for attrib files of unchanged directories.
As I've written before, if you *think* you need BackupPC_nightly to run (or do
a better job), you really either need more disk space, or need to rethink what
data you want to keep backups of.
> I've ran it manually a few times and there's been no difference.
That is one of my favorite topics. NEVER RUN BackupPC_nightly MANUALLY! NEVER!
There are better ways to void your warranty. One of these days, I'll write a
patch that makes BackupPC_nightly refuse to run if not invoked by the daemon.
Why does everyone assume that if something doesn't happen as they imagine, the
software must be faulty, and that by doing something arbitrary *with this
supposedly faulty software*, they will fix things? Because that is the way
Windoze "works"?
BackupPC is not powered by millions of dollars worth of paid developer time.
It's free. It's open source. It doesn't need the incentive of tons of bugs to
get people to spend money on ever the newest versions of new bugs. It just
works, it's stable, and it's versatile. It's not as if you couldn't still run a
2.x version and get perfectly usable backups.
There are bugs left (e.g. you can run BackupPC_nightly manually), but *most of
the time* misbehaviour turns out to be due to usage errors, configuration
errors, or hardware errors. Or misunderstanding the concepts.
Just to prove my point, you went to the trouble of running it *a few times*!?
What is that supposed to achieve? Do you want BackupPC to free a certain amount
of space each time? If I bug it long enough, it will delete something,
regardless of what data is still "needed" and what data isn't?
> |This was sent by kmwatters AT proobject DOT com via Backup Central.
[...]
Regards,
Holger
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