I do not use -z with rsync as I am on gigabit and would rather have the CPU
cycles as I get faster backups this way.
with ssh you can specify the -C flag to use compression if both sides
support it. the docs say that this is 'requesting' compression and I
believe that this is a 'use it if available, else dont' type command so I
think you can enable it without any bad effects.
I still suggest you start using the incremetal backups option, considering
the effect is very close to the same in the end. Fulls and incrementals will
both use the same hard disk space because of the hard links so the the
deficite in incrementals is just that a block level scan is not happening.
do you have any files that would be modified without changing either or both
the change time or the file length? I don't have any on my entire network
that except maybe an SQLO database but those files are well known to me and
I exclude them in my backups in favor of an SQL dump that i run in the
predump commands. Backuppc backs up the dump but excludes the live database
file.
You really dont need to do block level comparisons on the vast majority of
your files.
On Jan 11, 2008 10:30 AM, Rich Rauenzahn <[EMAIL PROTECTED]> wrote:
>
> > the previous post mentioned something about the compression being for
> > the pool. In fact you can also compress the rsync stream with the -z
> > flag which works great on limited bandwidth connections as long as you
> > have a decent CPU. The ssh stream
> I tried compressing the rsync stream and found the sessions hung, and
> someone on the list (Craig?) thought that the Rsync perl module didn't
> understand the option or something... I'd need to go back in the
> archives to find my post, and can't right now. Do you have -z working
> in rsync?
>
> > can also be compressed but I would recommend not using ssh compression
> > if you are using rsync compression because the
> >
> Also, if you are doing this over ssh, you can turn down ssh encryption
> to something faster but less secure. I use the option "-carcfour" on
> the ssh command line.
>
> Rich
>
>
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