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On Thursday 15 May 2003 09:10 am, Eric Sproul wrote:
> Randy,
> I've got three theories... ;)
>
> 1. Most of the data on the filesystem is changing constantly, such that
> incrementals are almost as big as fulls.
I don't believe this is true. I know I modify a lots of files on a daily
basis, but no way do I modify 90-95% of them every day. I just ran a "find
/home -ctime -2" and see about 100 files listed totaling a mere 10-20 MB or
so.
> 2. Dump is having trouble estimating what has changed and what hasn't.
> You didn't mention what OS and filesystem you are using.
Yes, dump does seem to be having a problem. The system a Slackware Linux,
using Reiser FS for the filesystem. I'm not having this problem with another
client running across the network, only on the local computer which is both
an Amanda client and server.
> 3. There are a few large files that keep changing, accounting for a
> disproportionately large percentage of the incremental data, having the
> same effect as #1. Say I've got a 7.5GB filesystem with two files, one
> is 10K the other is 7.4GB. The 7.4GB file is modified, so when an
> incremental is run, all 7.4GB of that file have to be backed up again,
> even though only one file changed. That is an extreme example, but may
> help point you to your answer.
Nope. I have lots and lots of little files, mostly normal word processing
and/or software projects that I work on. A few large files, but nothing over
500 MB or so.
> Cheers,
> Eric
>
> On Thu, 2003-05-15 at 09:12, Randy Pearson wrote:
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> > Hi All,
> >
> > I've been using Amanda for quite some time (3-4 years) and have been
> > quite happy with it. Thanks to all the developers for a great backup
> > system.
> >
> > Now for my question. Does anybody know why level 0 and level 1 dumps of
> > my disks would be the same approximate size always?
> >
> > I thought a level 1 dump supposed to be an incremental backup, while
> > level 0 is a full backup. Here are some extracts for the Amanda reports
> > of the dumps of my /home disk. Looks to me like Amanda is backing up
> > every file, no matter what the dump level is.
> >
> > In case it makes any difference, this occurred with both versions 2.4.3b2
> > and 2.4.4.
> >
> > Thanks for any advise you can give me.
> >
> > Randy
> >
> > May 14
> > - -------
> > DUMP SUMMARY:
> > DUMPER STATS TAPER
> > STATS HOST DISK L ORIG-KB OUT-KB COMP% MMM:SS KB/s
> > MMM:SS KB/s - -------------------------------- ---------------------
> > -------------------- zev /home 1 7436050 4881984 65.7
> > 43:26 1873.6 90:42 897.1
> >
> > May 13
> > - ------
> > DUMPER STATS TAPER
> > STATS HOST DISK L ORIG-KB OUT-KB COMP% MMM:SS KB/s
> > MMM:SS KB/s - -------------------------------- ---------------------
> > -------------------- zev /home 1 7436050 4881984 65.7
> > 43:26 1873.6 90:42 897.1
> >
> > May 9
> > - -----
> > DUMPER STATS TAPER
> > STATS HOST DISK L ORIG-KB OUT-KB COMP% MMM:SS KB/s
> > MMM:SS KB/s - -------------------------------- ---------------------
> > -------------------- zev /home 0 7518580 4895872 65.1
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