I usually set and recommend a country mirrors pool to avoid this.

Nevertheless, on help threads on the french forum, I often see users who sat a specific mirror, trying to optimize speed.

When checking https://launchpad.net/ubuntu/+archivemirrors I observe that "up to date" is not the majority and that some lag up to one week

Why is this ? Isn't the mirroring process automated ?


The answer is "It Depends on the Mirror and Its Configuration".

Mirrors are able to sync in more than one way. Typically, they rsync data over more than once a day, but sometimes less than that if they are limited on bandwidth. There is a mirror "push" process which can rsync data to the mirror as it is made available in the repositories, but this can be bandwidth intensive.

As a result, because syncs may not happen in a timely manner on the various mirrors, they can be out of sync for various time periods.

Note that not all mirrors are run by Canonical - they run the official Repository servers and mirrors, but not necessarily the rest of the mirrors on that list. There are a number of mirrors set up by various companies that're on the mirrors list who have asked to be on the list, and it's up to those individual mirror providers to have the proper sync systems set up to sync up in a timely manner.

  • Thank you for this enlightment. I'm still puzzled with this today's example : OVH http 4 Gbps One week behind Ovh is a hoster supposed to be a french unicorn, the bandwidth shouldn't be an issue, rsync is not really an obscure tool and nevertheless... I give this example, but other lagging mirrors have similar operators and bandwidth. – nam1962 Dec 17 '18 at 15:05
  • Does this mean that Canonical didn't give them specs & SLA ? – nam1962 Dec 17 '18 at 15:14
  • wiki.ubuntu.com/Mirrors for more details. And for any additional information beyond the wiki page there, I suggest you reach out to the Mirrors Team with your questions, as they are better equipped to answer them than Ask Ubuntu is. – Thomas Ward Dec 17 '18 at 15:15
  • I see in addition of my example that the main mirror status page tells the most lagging package. In fact for OVH : Source code mirrored Version Status The Disco Dingo One day behind The Cosmic Cuttlefish Up to date The Bionic Beaver One week behind it seems to be the Bionic source code. I'll stick to the country pool or to the world pool ! – nam1962 Dec 17 '18 at 16:37

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