On Fri, 21 Sep 2012 21:40:14 +0200 Simon Toedt wrote:
> On Thu, Sep 13, 2012 at 1:28 AM, Glenn Fowler <[email protected]> wrote:
> >
> > On Wed, 12 Sep 2012 03:08:50 +0200 Simon Toedt wrote:
> >> I'm in the process of updating our development machines and noticed
> >> that using AST pax is a lot faster than GNU tar.
> >
> >> But... is there any catch I should know about? What are the
> >> recommended options to backup a Linux home directory and what are the
> >> recommended options to restore it?
> >
> > # to create the backup -- -P will not follow symlinks
> > cd
> > pax -P -wvf /some-dir-not-under-$HOME/home.tgz -x tgz .
> > # to restore -- -N will only restore files that are newer in the archive
> > cd
> > pax -N -rvf /some-dir-not-under-$HOME/home.tgz
> >
> > if you plan on doing this periodically then use the base+deltas method
> > but be aware that on restore this method will delete files that have been
> > created since the last delta -- so make an up-to-date delta before restoring
> > an old one
> >
> > *before you backup/restore precious dirs/files do some tests on throwaway
> > copies*
> >
> > # create a base
> > cd
> > pax -P -wvf /some-dir-not-under-$HOME/home.base.pax .
> >
> > # later create deltas -- delta will only contain changes (mod, create,
> > delete)
> > cd
> > pax -P -wvf /some-dir-not-under-$HOME/home-01.pax -z
> > /some-dir-not-under-$HOME/home.base.pax .
> > ...
> > pax -P -wvf /some-dir-not-under-$HOME/home-02.pax -z
> > /some-dir-not-under-$HOME/home.base.pax .
> >
> > # list delta
> > cd
> > pax -vf /some-dir-not-under-$HOME/home-02.pax -z
> > /some-dir-not-under-$HOME/home.base.pax
> >
> > # read delta
> > cd
> > pax -rvf /some-dir-not-under-$HOME/home-02.pax -z
> > /some-dir-not-under-$HOME/home.base.pax
> >
> > after looking at the delta restore semantics -Nr ... -z ... should not
> > delete files newer than the delta (it currently does)
> Thank you.
> IMO it may be nice to have a Rosetta stone to translate tar/GNU tar
> options into pax/AST pax options.
> For example, what are the pax equivalents for these calls:
> 1. tar -cvf - homedir | bzip2 -9 >foo.tar.bz2
pax -vwf foo.tar.bz2 -x tbz homedir
{ tlz tgz tbz txz tvz } are shorthand for { tar:compress tar:gzip tar:bzip2
tar:xz tar:vczip }
the t* => tar:* shorthand is not documented, but that will be fixed
see pax --?x
> 2. bzcat <foo.tar.bz2 | tar -xvf -
all formats are recognized on input, including compressed formats
as long as pax --?x lists the format/compression this will work on all input
pax -rvf <whatever-pax-says-it-can-handle>
> Does AST pax support NFS4 ACL records?
acls and holes are on the todo list
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