On Thu, 2018-08-16 at 01:44 +0000, Andreas Dilger wrote: > There is also the separate question of whether anyone running an > ancient > version of Lustre (which also requires an ancient kernel) will be > updating > their MPICH to the latest version?
Upgrading MPICH requires no privileges and no maintenance window. I would expect folks to upgrade MPICH frequently -- as I did/do on our Blue Gene system for one example. Upgrading Lustre has proven to be a somewhat more challenging process for more than a few sites, based on the OpenSFS survey. > In any case, it appears that the MPICH demands on llapi_layout_*() > are > fairly small, and it should be straight forward to implement stubs > for the > few functions that it is using (which are for non-PFL files). If > such > an MPICH library is run against a newer version of Lustre, it will > return > some approximate values via the old interface, which may not be ideal > but > are no worse than runnnig an older MPICH library. Indeed: one needs only implement 14 routines. ==rob _______________________________________________ lustre-discuss mailing list [email protected] http://lists.lustre.org/listinfo.cgi/lustre-discuss-lustre.org
