Darren J Moffat <darr...@opensolaris.org> wrote:
> I'm curious, why isn't a 'zfs send' stream that is stored on a tape yet
> the implication is that a tar archive stored on a tape is considered a
> backup ?
You cannot get a single file out of the zfs send datastream.
> >> ZFS system attributes (as used by the CIFS server and locally) ?
> >
> > star does support such things for Linux and FreeBSD, the problem on Solaris
> > is
> > that the documentation of the interfaces for this Solaris local feature is
> > poor.
> > The was Sun tar archives the attibutes is non-portable.
> >
> > Could you point to documentation?
>
> getattrat(3C) / setattrat(3C)
>
> Even has example code in it.
>
> This is what ls(1) uses.
It could be easily possible to add portable support integrated into the
framework that already supports FreeBSD and Linux attributes.
> >> ZFS dataset properties (compression, checksum etc) ?
> >
> > Where is the documentation of the interfaces?
>
> There isn't any for those because the libzfs interfaces are currently
> still private. The best you can currently do is to parse the output of
> 'zfs list' eg.
> zfs list -H -o compression rpool/export/home
>
> Not ideal but it is the only publicly documented interface for now.
As long as there is no interface that supports what I did discuss with
Jeff Bonwick in September 2004:
- A public interface to get the property state
- A public interface to read the file raw in compressed form
- A public interface to write the file raw in compressed form
I am not sure whether this is of relevance for a backup. If there is a need
to change the states, on a directory base, there is a need for an easy to use
public interface.
Jörg
--
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