[Lustre-discuss] Upgrade from 1.8.6 to 2.1?

[Andreas Dilger]

On 2011-10-23, at 10:55 PM, Brett Worth wrote:
> On 22/10/11 03:10, Prakash Surya wrote:
>> On Fri, Oct 21, 2011 at 08:58:39AM -0700, David Noriega wrote:
>>> Also could I have the servers move to 2.1 while still having the
>>> clients at 1.8.6?
>> 
>> AFAIK, yes this is possible.
> 
> What about running 1.6.5 clients to connect to a 2.1 server?
> 
> We have an old legacy system which has 1.6.5 which is currently connecting to a 1.8.6 
> server.  Will a 2.1 server still talk to something that old?

No that won't work.  1.8 clients have added code to handle the
protocol changes with 2.x servers.  There were a number of bug
fixes related to corner cases in protocol interoperability, so
it is recommended to use at least 1.8.5 clients, but 1.8.6 is
better.

Cheers, Andreas
--
Andreas Dilger 
Principal Engineer
Whamcloud, Inc.