[kwlug-disc] Backup and Recovery in the 21st Century
kb at 2bits.com
Tue Jan 12 14:34:35 EST 2010
On Tue, Jan 12, 2010 at 2:27 PM, Chris Irwin <chris at chrisirwin.ca> wrote:
> On Tue, Jan 12, 2010 at 13:19, Khalid Baheyeldin <kb at 2bits.com> wrote:
>> Re: ext4.
>> The print server I had was a clean Kubuntu 9.10 install, and defaulted
>> to ext4. So I tried installing dump from the repository and it did install
>> I ran dump on the / partition and it seemed to work. I used restore to
>> list the contents of the dump and it did list the files in it.
>> So, are you sure that ext4 does NOT support dump?
> Great, you made me put my money where my mouth was and I lost. :)
> I was making an assumption based on the man page (which still says ext2/3)
> and google searches that corroborated it. In retrospect, I suppose nobody
> posts to mailing lists saying "EVERYTHING IS OKAY", so if you're doing a
> search to find problems, you'll only find problems. I should have, you know,
> checked the actual documentation and changelogs.
> I did an `apt-get source dump` on Ubuntu Karmic, and it seems that dump
> 0.4b42-1 has the following entry in the debian/changelog:
> * new upstream version, closes: #378349, #511651
> The former refers to a documentation issue (not the ext4 omission), but the
> later refers to ext4. It seems dump was silently "working" but dumping
> unrecoverable garbage from ext4, which is obviously bad (it should succeed
> or fail, not both).
>  http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=511651
> Since this appears to be solved, I decided to see what the upstream CHANGES
> file had to say. Between b41 and b42 is the following entry:
> * Add (preliminary) ext4 support - thanks to libext2fs which does all
> the job for us. Thanks to Gertjan van Wingerde for the patch.
> So it looks like there is at least some support for ext4. It also seems
> that since b40 Extended Attributes and ACLs are supported. I also noticed
> that this update for ext4 support came out 18 June 2009, while the previous
> release was over three years earlier on 2 January 2006. I'm not sure if that
> is a feature or a deterrent when it comes to backup software :)
Thanks for the clarification.
> Since I am using LVM, I think snapshots + dump is going to prove quite
Please post where you get with this, it would be interesting to many of us.
Also, for the original tape question: I would still be interested in
backup drives that can do hundreds of GBs per cartridge and does not require
Khalid M. Baheyeldin
Drupal optimization, development, customization and consulting.
Simplicity is prerequisite for reliability. -- Edsger W.Dijkstra
Simplicity is the ultimate sophistication. -- Leonardo da Vinci
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