[opensuse] Are bittorrent downloads reliable?
I downloaded the Opensuse 10.2 beta2 i386 DVD using ktorrent. Unfortunately, the md5sum of the downloaded iso image doesn't match the md5sum that is listed on the server. That would indicate the download was defective. Given that the DVD download is 4 GB and the chunks of the file come from so many different computers, is the probability of the download being incorrect somewhat high? I suppose there is some error checking built in. Just wondering if people have been successful in downloading the beta2 dvd using a torrent client. Would a torrent client other ktorrent be more reliable? Mike -- Michael A. Coan Woodlawn Foundation 524 North Avenue, Suite 203 New Rochelle, NY 10801-3410 Tel 914-632-3778 Fax 914-632-5502 -- To unsubscribe, e-mail: opensuse+unsubscribe@opensuse.org For additional commands, e-mail: opensuse+help@opensuse.org
On Monday November 20 2006 4:34 pm, Mike Coan wrote:
I downloaded the Opensuse 10.2 beta2 i386 DVD using ktorrent. Unfortunately, the md5sum of the downloaded iso image doesn't match the md5sum that is listed on the server. That would indicate the download was defective.
Given that the DVD download is 4 GB and the chunks of the file come from so many different computers, is the probability of the download being incorrect somewhat high? I suppose there is some error checking built in. Just wondering if people have been successful in downloading the beta2 dvd using a torrent client. Would a torrent client other ktorrent be more reliable?
Mike
Every chunk of a torrent is md5sum'd so in theory the complete download should have been md5sum'd constantly. And that goes for every seeder re-transmitting the chunks they have. One thing I'm not sure about is if the originating server has its file changed does that negate all the seeders that are no longer up-to-date? Could you have gotten chunks from different versions of the file? If the original file changes will the seeder's incorrect chunks be automatically replaced? I don't know but that could explain how your final *.iso's md5sum isn't correct. Someone around here will educate/correct me... Stan -- To unsubscribe, e-mail: opensuse+unsubscribe@opensuse.org For additional commands, e-mail: opensuse+help@opensuse.org
On 11/20/06, Stan Glasoe wrote:
Every chunk of a torrent is md5sum'd so in theory the complete download should have been md5sum'd constantly. And that goes for every seeder re-transmitting the chunks they have.
One thing I'm not sure about is if the originating server has its file changed does that negate all the seeders that are no longer up-to-date? Could you have gotten chunks from different versions of the file? If the original file changes will the seeder's incorrect chunks be automatically replaced? I don't know but that could explain how your final *.iso's md5sum isn't correct.
Someone around here will educate/correct me...
Stan
The checksum of every chink is written in the torrent file itself. So, if some one (it does not matter if this is the original uploader or someone else) stops his torrent client and replaces the file, than upon startup the client will check all the chunks and their sums and redown;load the from the others. In theory there is no way for someone to get wrong chunks. But ... if the torrent file was build against another version of the file, than the one you see on the website, and which checksum you compare, this just means that the files are not the same and who created the torrent file should be notified and check what's the problem. Btw, where from you got the md5sum for the dvd image? In the download section of opensuse.org for 10.2 beta 2, in the file MD5SUM there is no line for the dvd image. -- Svetoslav Milenov (Sunny) Even the most advanced equipment in the hands of the ignorant is just a pile of scrap. -- To unsubscribe, e-mail: opensuse+unsubscribe@opensuse.org For additional commands, e-mail: opensuse+help@opensuse.org
On Monday 20 November 2006 18:36, Sunny wrote: [stuff deleted]
Btw, where from you got the md5sum for the dvd image? In the download section of opensuse.org for 10.2 beta 2, in the file MD5SUM there is no line for the dvd image.
This could be my problem. The md5sum that I see listed on the server (mirrors.kernel.org/opensuse/distribution/openSUSE-10.2-Beta2/MD5SUMS is for openSUSE-10.2-Beta2-DVD-i386.torrent. I assumed that this is the md5sum for the iso image, but maybe that isn't the case. I googled a bit on torrents, and saw that it is recommended that the torrent include the md5sum for the file. I just assumed the md5sum for the torrent was the one for the underlying iso image. The md5sum for openSUSE-10.2-Beta2-DVD-i386.torrent is d3b5ee2947e1a63d0e8d327af36b82ff while the md5sum for the openSUSE-10.2-Beta2-DVD-i386.iso I have downloaded is 10de5d76f589a12cfbcc7eb372de145a Based on teh other answers people posted, it seems that bittorrent is pretty robust, so maybe the downloaded file is ok. Mike -- Michael A. Coan Woodlawn Foundation 524 North Avenue, Suite 203 New Rochelle, NY 10801-3410 Tel 914-632-3778 Fax 914-632-5502 -- To unsubscribe, e-mail: opensuse+unsubscribe@opensuse.org For additional commands, e-mail: opensuse+help@opensuse.org
On Tue, 2006-11-21 at 09:04 -0500, Mike Coan wrote:
On Monday 20 November 2006 18:36, Sunny wrote:
[stuff deleted]
Btw, where from you got the md5sum for the dvd image? In the download section of opensuse.org for 10.2 beta 2, in the file MD5SUM there is no line for the dvd image.
This could be my problem. The md5sum that I see listed on the server (mirrors.kernel.org/opensuse/distribution/openSUSE-10.2-Beta2/MD5SUMS
is for openSUSE-10.2-Beta2-DVD-i386.torrent.
I assumed that this is the md5sum for the iso image, but maybe that isn't the case. I googled a bit on torrents, and saw that it is recommended that the torrent include the md5sum for the file. I just assumed the md5sum for the torrent was the one for the underlying iso image.
The md5sum for openSUSE-10.2-Beta2-DVD-i386.torrent is
d3b5ee2947e1a63d0e8d327af36b82ff
while the md5sum for the openSUSE-10.2-Beta2-DVD-i386.iso I have downloaded is
10de5d76f589a12cfbcc7eb372de145a
Based on teh other answers people posted, it seems that bittorrent is pretty robust, so maybe the downloaded file is ok.
Mike
You'll find the md5sums here: http://ftp-1.gwdg.de/pub/opensuse/distribution/openSUSE-10.2-Beta2/delta-iso... -- Ken Schneider UNIX since 1989, linux since 1994, SuSE since 1998 -- To unsubscribe, e-mail: opensuse+unsubscribe@opensuse.org For additional commands, e-mail: opensuse+help@opensuse.org
On Tuesday 21 November 2006 09:24, Kenneth Schneider wrote:
[stuff deleted]
You'll find the md5sums here:
http://ftp-1.gwdg.de/pub/opensuse/distribution/openSUSE-10.2-Beta2/delta-is o/README.DVD.txt
Thanks very much, Ken. I wouldn't have thought to find the md5sum for the iso under the delta-iso directory. Unfortunately the md5sum for the beta2 iso doesn't match the iso of my downloaded file, so I guess the transfer was garbled somehow. Mike -- Michael A. Coan Woodlawn Foundation 524 North Avenue, Suite 203 New Rochelle, NY 10801-3410 Tel 914-632-3778 Fax 914-632-5502 -- To unsubscribe, e-mail: opensuse+unsubscribe@opensuse.org For additional commands, e-mail: opensuse+help@opensuse.org
-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Mike Coan schrieb:
Thanks very much, Ken. I wouldn't have thought to find the md5sum for the iso under the delta-iso directory. Unfortunately the md5sum for the beta2 iso doesn't match the iso of my downloaded file, so I guess the transfer was garbled somehow.
Maybe trying is better than guessing. Burn it, boot it, check it out. Or are you that short on recordables? I never had any problem with the integrity of torrent downloads. Checksumming is kind of a basic principle of torrent downloading, isn't it? Tilman -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.2 (GNU/Linux) Comment: Using GnuPG with SUSE - http://enigmail.mozdev.org iD8DBQFFZHfv9ZPu6Yae8lkRAg8TAJ94O5TEjTanp4ysNRoORZ5CVMmyXgCaA78I tR0/LUbMy9lzSKGlqCtUoiU= =WYnO -----END PGP SIGNATURE----- -- To unsubscribe, e-mail: opensuse+unsubscribe@opensuse.org For additional commands, e-mail: opensuse+help@opensuse.org
Mike Coan wrote:
I downloaded the Opensuse 10.2 beta2 i386 DVD using ktorrent. Unfortunately, the md5sum of the downloaded iso image doesn't match the md5sum that is listed on the server. That would indicate the download was defective.
Given that the DVD download is 4 GB and the chunks of the file come from so many different computers, is the probability of the download being incorrect somewhat high? Depends on many factors. A good reliable internet connection sure helps
Correct. the odds.
I suppose there is some error checking built in. Just wondering if people have been successful in downloading the beta2 dvd using a torrent client. Would a torrent client other ktorrent be more reliable?
I don't think the client makes that much difference. I know with ktorrent, you can go to Downloads, Check Data Integrity, and this will do a final checksum check on all the downloaded chunks, and if any are found with errors it will redownload the bad chunks, which usually only take a few seconds. IMHO, bittorent is the only way to download huge DVD downloads on a not so reliable ISP, as it will only need to redownload the errant chunks instead of the whole thing again. HTH. -- Joe Morris Registered Linux user 231871 -- To unsubscribe, e-mail: opensuse+unsubscribe@opensuse.org For additional commands, e-mail: opensuse+help@opensuse.org
participants (6)
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Joe Morris (NTM) -
Kenneth Schneider -
Mike Coan -
Stan Glasoe -
Sunny -
Tilman Vogel