Jigdo - A Professional Letter to Mike McGrath

Jesse Keating jkeating at redhat.com
Thu Dec 6 21:42:57 UTC 2007

On Thu, 6 Dec 2007 14:28:13 -0700
Jonathan Steffan <jonathansteffan at gmail.com> wrote:

> The amount of storage and bandwidth able to be saved can be
> illustrated by a simple comparison between the efficiency of chopping
> up a 3.4GB iso9660 file system arbitrarily (by a static chunk size)
> and the same file system based on contents (file by file.) For a
> BitTorrent, Fedora's current choice for sharing Spins, the hosted
> data is only valid for a given chunk on a single ISO. This data's
> footprint (equal to the combined chunk sizes of the entire torrent)
> can be used for nothing but this Spin. To be able to host 5 Spins
> composed from similar trees via BitTorrent, we now have a footprint
> of 17GB, not to mention "seeders" have to run BitTorrent software to
> be able to contribute to the swarm. Alternatively, Jigdo can be used
> to reduce the footprint of these 5 Spins to about 4GB. The amount of
> additional data needing to be hosted for each Spin, in addition to
> what data is already pushed to the mirrors, is about 150MB per ISO
> with anaconda and about 200KB for ISOs without the installer bits. To
> help illustrate the efficiency of using Jigdo vs BitTorrent, the
> footprint for 250 Spins is 850GB for BitTorrent and about 40GB for
> Jigdo. Additionally, a reduction in overhead can be achieved by
> removing the need for the BitTorrent tracker and all related network
> traffic without requiring any additional work on the part of mirror
> administrators.

Question.  Spins.fp.o is mostly about Live images no?  Live images are
essentially a big squasfs image wrapped up in an iso with some bootable
stuff involved?  How would jigdo possibly help here?

Jesse Keating
Fedora -- All my bits are free, are yours?
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