switching discs during install
Mike Clarke
jmc-freebsd2 at milibyte.co.uk
Sun Sep 7 09:22:41 UTC 2008
On Sunday 07 September 2008, James Strother wrote:
> That said, I still think that as long as the freebsd foundation
> distributes CD images it would be worthwhile to make them as
> effective as possible. Actually, even if the install were moved to a
> DVD, the ordered install I proposed would still improve the
> situation. When the packages are haphazardly ordered on the disc,
> the CD/DVD reader is forced to perform a large number of seeks that
> dramatically reduces data throughput. When they are read in order,
> read rates should be much better.
They might not be as haphazard as you suggest. ISTR once reading that
the CDs were arranged with the most popular packages on the first CD so
that you would only need to download disk 2 (and 3) if you wanted some
of the less common packages. With your suggested layout it's quite
likely that a package which most of the others depend on would be right
down at the bottom of the list with the result that you'd invariably
need to download all 3 CD images.
I think the best way to avoid the need for frequent CD switching would
be for sysinstall to sort the list of selected packages into CD order
before installing them. I imagine this would require some changes to
pkg_add to prevent it from installing dependencies and I expect the
possible benefits would not be considered to be sufficient to justify
the effort.
--
Mike Clarke
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