Re: VERY frustrated with FreeBSD/UFS stability - please help or comment...

--- Eric Anderson <andersonfreebsd.org> wrote:

> On 05/22/07 06:39, Dag-Erling Smørgrav wrote:
> > Gore Jarold <gore_jaroldyahoo.com> writes:
> >> Specifically, I have private departmental
> fileservers that other
> >> fileservers rsync to using Mike Rubel-style
rsync
> snapshots:
> >>
> >>
> h
ttp://www.mikerubel.org/computers/rsync_snapshots/
> >>
> >> This means that the remote system runs a
script
> like this:
> >>
> >> ssh userhost rm -rf backup.2
> >> ssh userhost mv backup.1 backup.2
> >> ssh userhost cp -al backup.0 backup.1
> >> rsync /files userhost:/backup.0
> > 
> > This is extremely inefficient, as you have
> discovered.
> > 
> > Speaking in the abstract, what you want to do
> every day is the
> > following:
> > 
> > client1% rsync --archive --delete /vol
> server:/backup/client1
> > client2% rsync --archive --delete /vol
> server:/backup/client2
> > server% for vol in /backup/* ; do mksnap_ffs $vol
> $vol/.snap/`date` ; done
> > 
> > No copying or deleting; you take a snapshot when
> the rsync job is done,
> > and the next day you rsync again to the same
> directory; only what has
> > actually changed will be transferred, and there
is
> no need to create and
> > populate full copies of each directory tree every
> time.
> 
> 
> That's good for small file systems, but if you have
> a multi-terabyte 
> file system, you're not going to be too happy about
> those results.  The 
> snapshot will take a *very* long time, on a nearly
> full file system.


And in addition, you're using snapshots, which adds a
lot more instability, IMO.  There are many PRs (most
solved, I hope) that indicate instability running
snapshots, not to mention the risk of filling a
filesystem accidently, etc.


 
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