[GTALUG] On the subject of backups.

[David Mason]

ZFS is another option. And it handles delta-backups very easily.

../Dave
On May 5, 2020, 11:27 PM -0400, Lennart Sorensen via talk <talk at gtalug.org>, wrote:
> On Mon, May 04, 2020 at 10:42:25PM -0400, Alvin Starr via talk wrote:
> > The files are generally a few hundred KB each. They may run into a few MB
> > but that's about it.
> > I use to use ReiserFS back in the days of ext2/3 but it kind of fell out of
> > favor after the lead developer got sent away for murder.
> > Reiser was much faster and more reliable than ext at the time.
> > It would actually be interesting to see if running a reiserfs or btrfs
> > filesystem would actually make a significant difference but in the long run
> > I am kind of stuck with Centos/RH supported file systems and reiser and
> > btrfs are not part of that mix anymore.
>
> ReiserFS was not reliable. I certainly stopped using it long before
> the developer issues happened. The silent file content loss was just
> unacceptable. And it wasn't a rare occurance. I saw it on many systems
> many times. ext2 and 3 you could at least trust with your data even if
> they were quite a bit slower. Certainly these days RHEL supports ext2/3/4
> and XFS (their default and preferred). I use ext4 because it works well.
> GlusterFS defaults to XFS and while technically it can use other
> filesystems (and many people do run ext4 on it apparently) I don't
> believe they support that setup.
>
> > I am not sure how much I can get by tweaking the filesystem.
> > I would need to get a 50x -100x improvement to make backups complete in a
> > few hours.
> > Most stuff I have read comparing various filesystems and performance are
> > talking about percentage differences that is much less than 100%.
> >
> > I have a feeling that the only answer will be something like Veeam where
> > only changed blocks are backed up.
> > A directory tree walk just takes too long.
>
> Well, does the system have enough ram? That is something that often
> isn't hard to increase. XFS has certainly in the past been known to
> require a fair bit of ram to manage well.
>
> --
> Len Sorensen
> ---
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