JD
Could you please clarify as to where you accessed your current software? As this is the project for the Lustre community releases, I initally had read 2.0 to mean the community 2,0 release which came out in 2010 timeframe but as you address the ticket as "Support" I wonder if in face you mean the Intel Entterprise Edition 2.0 which came out in 2014.
Peter
I meant the community release, sorry for the confusion and it's 2.1 not 2.0.
[root@**** ~]# rpm -qa | grep lustre- lustre-2.1.4-2.6.32_279.14.1.el6_lustre.x86_64.x86_64 lustre-modules-2.1.4-2.6.32_279.14.1.el6_lustre.x86_64.x86_64
Best Regards,
JD.
JD
2.1.4 is not a community release - it was a Whamcloud customer maintenance release but this does help me understand your environment better. So let me check that I understand your requirements correctly - you have a current RHEL 6 cluster and you wish to introduce some new clients that will use RHEL 7 and you would like to know whether it is possible to do this without upgrading your whole cluster?
Peter
Dear Peter,
This is correct 
The urgency is to be able to support CentOS 7 clients in some way which would then give us some time to plan the cluster replacement, understanding the different options like type of hardware, version, support,..
-jd
JD
The community releases officially only support the previous version (so 2.7 in the case of the 2.8 release) but often compatibilty will naturally remain spanning multiple release versions. I have not heard of anyone trying 2.8 clients with 2.1 servers but I do not expect this to work as I think that I heard 2.1/2.7 clients did not work. I expect that your best option would be to move to a 2.5.x release on your existing cluster and then that more likely will work ok with 2.8 (or even 2.9) clients. I stress that I have not tested any of these options myself but this is based on experience and anecdotal evidence over the years.
Peter