Re: [Xen-users] Re: cow implementation

[Molle Bestefich <molle.bestefich@xxxxxxxxx>]

Anand wrote:
> > > What are you using then ?
> >
> > Uhm, tar+gzip and a differ for now :-)...
> >
> > I'll admit it's far from optimal :-).
>
> huh ? i have to say it just went over my head.
> Care to fly a little low so i can understand something about it ? ;)

I make a tar archive of each domU filesystem:
# tar /backup/domain1_`date +%s`.tar /{bin,sbin,etc,home,lib,opt,usr,var}

Then gzip it.

I'm experimenting with various binary differs so I can diff the backup
locally on the server against the previous backup .tar.gz and only
send the couple of MB that actually changed to my backup server.  The
backups I've made in the past worked by sending the entire .tar.gz,
which is a couple GB each, which was sort of inefficient.

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