Very Computer

by **Chris Boy** » Tue, 26 Nov 1996 04:00:00

The handbook describes how to restore a system backup made by
tape dumps (using dump) of the file systems after a disaster. I
assumed that applies to the same disk or a direct replacement.

Or is it possible to use a quite different size and possibly
even different interface. Replace an IDE with SCSI for instance.

Providingi, of course that the disks are partitioned (Unix) in
the same way, although of a different size.

A tar backup would be OK, even with a different partition scheme.
However does (g)tar backup device files, even those large minor
no's now in FreeBSD?

Just a bit confused on backup policy. Since all my experiance has
been with Interactive SVR3 and 3rd party backup software. Don't
all laugh :-)

Thanks.

Chris

--

For information about Multiple Sclerosis on the WWW http://www.infosci.org/

by **Jan van den Bos** » Tue, 26 Nov 1996 04:00:00

>The handbook describes how to restore a system backup made by
>tape dumps (using dump) of the file systems after a disaster. I
>assumed that applies to the same disk or a direct replacement.
>Or is it possible to use a quite different size and possibly
>even different interface. Replace an IDE with SCSI for instance.

Usefull information is in the Unix System Manager's Manual (SMM)
of BSD4.3 in chapter 6.4 'Moving file system data'.
Yuo could even move filesystem data from one to another filesystem
using a pipe with dump/restore. (only restriction: it should fit
in it)

Quote:>Providingi, of course that the disks are partitioned (Unix) in
>the same way, although of a different size.
>A tar backup would be OK, even with a different partition scheme.
>However does (g)tar backup device files, even those large minor
>no's now in FreeBSD?

Tar must be used if you want to merge a filesystem into another.

Quote:>Just a bit confused on backup policy. Since all my experiance has
>been with Interactive SVR3 and 3rd party backup software. Don't
>all laugh :-)
>Thanks.
> Chris

- Jan

>--

>For information about Multiple Sclerosis on the WWW http://www.infosci.org/

by **J Wuns** » Wed, 27 Nov 1996 04:00:00

> The handbook describes how to restore a system backup made by
> tape dumps (using dump) of the file systems after a disaster. I
> assumed that applies to the same disk or a direct replacement.

> Or is it possible to use a quite different size and possibly
> even different interface. Replace an IDE with SCSI for instance.

It is. While dump(8) reads the raw device (so you can dump an
unmounted filesystem), the dump tape itself is written in a format
that allows restoring onto a different disk easily (unlike dd(1) which
is the logical predecessor of dump(8)).

Quote:> Providingi, of course that the disks are partitioned (Unix) in
> the same way, although of a different size.

As long as everything fits, it is okay.

Quote:> A tar backup would be OK, even with a different partition scheme.
> However does (g)tar backup device files, even those large minor
> no's now in FreeBSD?

No, it doesn't, nor is it able to restore the file flags (see
chflags(1)). cpio can backup the large dev nodes in -H crc or -H newc
mode, but can't cope with the file flags either.

--
cheers, J"org

Never trust an operating system you don't have sources for. ;-)

by **J Wuns** » Thu, 28 Nov 1996 04:00:00

Quote:> >A tar backup would be OK, even with a different partition scheme.
> >However does (g)tar backup device files, even those large minor
> >no's now in FreeBSD?
> Tar must be used if you want to merge a filesystem into another.

Actually not. While dump(8) can only dump entire filesystems,
restore(8) can perfectly merge multiple dumps into a single
filesystem.

--
cheers, J"org

Never trust an operating system you don't have sources for. ;-)

Very Computer

restore dumps to new disk?

restore dumps to new disk?

restore dumps to new disk?

restore dumps to new disk?

restore dumps to new disk?