On 09/22/2011 06:20 AM, Rudi Ahlers wrote: > On Thu, Sep 22, 2011 at 12:37 PM, John R Pierce <pierce@xxxxxxxxxxxx> wrote: >> On 09/22/11 3:08 AM, Sebastian Schubert wrote: >>> Am 22.09.11 11:59, schrieb John R Pierce: >>>>> On 09/22/11 2:13 AM, John Doe wrote: >>>>>>> If you want to take the risk anyway, the following (untested) might work: >>>>>>> Modify your /etc/yum.repos.d/CentOS-Base.repo >>>>>>> try to replace the baseurl's $releasever with 5.6... >>>>> >>>>> no, as the 5.6 specific files are removed when 5.7 is released. you'd >>>>> have to get a clone of the vault's 5.6 directory and set that up as a >>>>> local repository instead, then point the repo file to that. >>> crap ... the 5.6 files are still there .. just change the baseurl like >>> john doe wrote and you'll get an update to 5.6 >> >> no, they aren't. >> >> http://mirror.centos.org/centos/5.6/ >> >> empty. except a readme file telling you to look in /5/ instead, which >> has the 5.7 stuff in it. >> > > > > Why would the 5.6 stuff have been removed? > > Apart from the "5.7 is more secure" answer, or even "we're running out > of disk space", what is the actual reason behind this? > > surely a few versions of the OS won't take up that much space? 1TB & > 2TB HDD's these day cost a few dollars so I don't think that's the > real reason. And it can't be bandwidth either since the files are > mirrored to many other servers around the globe. > > They are removed because they do take up too much disk space. The CentOS project has to maintain dozens of servers as mirrors/rsync machines. We have to sync to hundreds of external (that is, not maintained by the CentOS Project ... but can be used by CentOS users) mirrors All of our internal (the ones maintained by the CentOS Project) Mirror servers are donated by hosting providers and we only get what they are willing to donate. If they give us a machine with a 1 TB drive, great. If it has 500GB, that is what we get. Some of them upgrade us, some don't. We can only have a "repository to mirror" that is as large as the "smallest drive" on the machines we want to use a a mirror. As we increase the size of the repo, we drop more and more machines out of the list of machines we can use a mirror/rsync machines. Not to mention that we eliminated people externally who can mirror CentOS for users. You have to remember that there are millions of CentOS machines that update and we have to not provide 1 location that contains all the files, but enough locations available that contain all of the files to serve several million users. So, you say, just upgrade the machines to a bigger hard drive. Well that is much harder than you would imagine. First off, they are not OUR machines. Secondly, if they were OUR machines, we would need to buy the drives and pay someone to install them as we have machines all over the world. (As a side note, we are managing internal CentOS Project machines in 12 countries on 5 continents) If you wanted to upgrade 250 servers, and if you wanted to pay $200.00 each for one of those cheap hard drive to do it ... then that would be: 250 x $200.00 = $50,000.00 I don't know about you ... but I can't write a $50K check to make that happen. If you can, I'll send you my address. Even if we DID have the space on the CentOS machines, there would be the time (and bandwidth) required to stand up a new mirror or to maintain all the old mirrors. This gets significantly longer if we maintain all the trees on all the servers. The vast majority of requests are only for the latest tree ... but the releases would be significantly delayed to move around old trees. So, we only mirror as installable, the latest of each of the supported versions. The rest we maintain available in archive at vault.centos.org. You can download and use those yourself if you want to do so.
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