File:LUG2019-Hybrid Storage with Lustre-Rutman.pdf

Vendors are now offering Lustre storage systems with flash-based OSTs and MDTs in addition to traditional HDD OSTs. With the introduction of multiple classes of storage tiers, new questions arise for system designers. What are the various use cases that are well-served by mixed systems? What are the right ratios of flash to disk? What features in Lustre lend themselves to tier management? This presentation will explore various dimensions of these issues and look at a number of new Lustre features Cray is developing to ease management of mixed-media systems.