[OpenAFS] dbservers version

Jean-Marc Choulet jm130794@gmail.com
Mon, 12 Dec 2016 20:33:13 +0100

Le 12/12/2016 à 18:34, Jeffrey Altman a écrit :
> On 12/12/2016 10:26 AM, Jean-Marc Choulet wrote:
>> Hello,
>> At work, we have only one dbserver in version 1.6.1 (Debian 6). We want
>> to add another dbserver but in a different version : v1.6.9 (Debian 8).
>> Is it possible without upgrade the first dbserver ?
>> Thanks,
>> Jean-Marc.
> There is little benefit to adding a second DB server unless you are also
> adding a third.  In a two server scenario, the server with the lowest IP
> (because of the extra 1/2 vote) can elect itself coordinator (sync site)
> and the other server never can.  Failure of the only server that can
> become the coordinator results in an outage.  A minimum of three DB
> servers is required to provide redundancy.
> While it is possible to continue operating the 1.6.1 (Debian 6) DB
> servers as part of a ubik quorum.  You should do so with the utmost
> care.  Over the last two years several critical bugs in the ubik
> protocol implementation have been fixed which can result in corrupted
> databases.  Some of the scenarios result in empty databases being
> replicated to all servers.  The safest path is to upgrade the existing
> database server to OpenAFS 1.6.20 before increasing the size of the quorum.
> Jeffrey Altman

Thank for your anwser. We will download OpenAFS 1.6.20 sources. We will 
compile and install the result in /usr/local for the first dbserver.
After, how will we import the old database ? The process is simple or 
complicated ?