Hi all,
Just thought of posting this (in case someone might be interested).
Debian has a neat package/mechanism called debdelta where upgrades are
handled by downloading only the differences between versions. This
provides major bandwidth savings. Just to make it clear, I am giving
below the figures for one such session of upgrade.
This has been done my machine running debian testing+unstable. Not sure
if it is available on lenny. Anyway, what is there to upgrade in a
stable as rock version (other than security)? :-)
The process of using it is quite simple :
* Install debdelta
* run apt-get update
* run debdelta-upgrade
This downloads the deltas, patches the old ones and keeps them in
/var/cache/apt/archives
* run apt-get upgrade
Here are the savings I mentioned:
* apt-get update
* apt-get upgrade
....
Need to get 118MB of archives.
...
* debdelta-upgrade -v
...
Delta-upgrade statistics:
download deltas size 15.9M time 291sec speed 54.5k/sec
patching to debs size 107M time 236sec speed 452k/sec
download debs size 911k time 18sec speed 48.4k/sec
total resulting debs size 108M time 317sec virtual speed: 340k/sec
Some deltas were not available so
* apt-get upgrade
...
Need to get 18.3MB/118MB of archives
...
So, in all I had download just 15.9+18.3=34.2 M of stuff. That is a
massive 72% savings on my bandwidth, time, money whatever :-)
Those running debian testing/unstable, can give it a try.
BTW, ubuntu has debdelta package in its repo, but does not provide
deltas for download. Correct me if I am wrong.
HAND,
Regards,
--
Sridhar M.A.
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