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From YouTube: What are “caps”? (And Why Won’t my Client Drop Them?) - Gregory Farnum, Red Hat

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What are “caps”? (And Why Won’t my Client Drop Them?) - Gregory Farnum, Red Hat

CephFS is a powerful file system, but sometimes the performance metrics and error messages developers talk about are abstract and obscure. This talk will illuminate CephFS file capabilities: how they are thoroughly different from the unfortunately-similarly-named CephX caps, their purpose and utility, and why they are a critical performance and correctness issue. Understand the warning messages you may see about clients holding on to them and failing to drop caches and how to read their output. Finally, get a brief lesson in how to program with caps when working in Ceph’s client libraries!

About Gregory Farnum
Principal Software Engineer, Red Hat
Greg Farnum has been in the core Ceph development group since 2009. Now a Red Hat employee, Greg has done major work on all components of the Ceph ecosystem, and currently focuses on testing and the core RADOS system.