[Twg] Cray priorities list

[John Carrier]

Cray has focused on requirements in the Availability, Storage Management, and Performance categories.   

We believe the requirements and features described in the Availability and Storage Management are foundational in nature and, as a result, we need to start working on them now to ensure feature landings in years to come.    We also see the requirements in the LNET category as improving Lustre resiliency and, as such, we consider them as additions to the Availability category.   We are hopeful that the new metadata features will greatly improve metadata performance.  Nonetheless, we recognize that we must never be complacent that Lustre performance is "good enough" and, as new performance improvements land, we must look for the next critical bottleneck.  Finally, we think the recent discussions of Lustre validation and test tools suggest that community investment is warranted to help create a consistent solution.

Our list of top priorities follows.  Our preference is that at least one requirement in each of the three above categories should be represented in the RFP.   Nonetheless, we have grouped the requirements together by category to make the list easier to parse.

1. Avoid RPC timeouts
2. Scalable fault management
3. File create performance
4. Single client performance
5. HSM and storage management infrastructure
6. OST migration/rebalancing
7. Asynchronous file replication (mirroring)
8. Improved LNET robustness
9. LNET channel bonding
10. Improved Lustre tests