[Lustre-discuss] Fwd: Lustre Interoperability Question
adilger at whamcloud.com
Wed Sep 19 14:48:57 PDT 2012
On 2012-09-19, at 10:38 PM, Ms. Megan Larko wrote:
> I am looking for clarification on a Lustre interoperability question.
> There is a system currently running RHEL 5.5 and Lustre 1.8.3 to
> which new hardware would like to be added. The new hardware is not
> supported under RHEL 5.x so it needs to be installed as RHEL 6.2 as a
> minimum. There is considerable doubt that one section of the old
> hardware will be able to function under RHEL 6. A version of the
> Lustre Manual for 2.0 (
> ) Section 16.1 indicates the possibility of heterogenous Luster
> servers---specifically mixed 1.8 and 2.0 servers. Section 16.1 goes
> on to state that Lustre 1.8.4 must be on the client and server nodes
> not upgraded to 2.0.
> Further research on this issue led me to Whamcloud LU-1116 (
> http://jira.whamcloud.com/browse/LU-1116 ) in which a bug (actually a
> linux kernel item name change) indicates that for a RHEL 6.2 client to
> support 1.8 Lustre (and 2.0 Lustre) the clients minimum Lustre
> version must be 1.8.7 (patched) or 1.8.8 (where the patch is landed).
> The Question: Can Lustre effectively serve a file system with
> heterogenous servers of RHEL 5.5 (1.8.3) and RHEL 6.2 (2.1 or better)?
> If not, would a solution of RHEL 5.5 with an upgrade from 1.8.3 to
> 1.8.8 function with the new hardware using RHEL 6.2 (either Lustre
> 1.8.8 or 2)? Do the clients have to run Lustre 1.8.8 at a minimum?
Interop rules are:
- servers all need to run the same version of Lustre
- 2.x clients will not work with 1.8 servers
- 1.8.7 clients will work with 2.x servers
- 2.1 clients will work with both RHEL5 and RHEL6
Best would be running 2.1.3 clients and servers everywhere.
Andreas Dilger Whamcloud, Inc.
Principal Lustre Engineer http://www.whamcloud.com/
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