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Barcelona, Spain
May 19-20, 2019
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Monday, May 20 • 15:30 - 16:10
What are “caps”? (And Why Won’t my Client Drop Them?) - Gregory Farnum, Red Hat

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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!

Speakers
avatar for Gregory Farnum

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, previously served as the CephFS tech lead, and currently works as an individual contributor focused on the core RADOS syst... Read More →



Monday May 20, 2019 15:30 - 16:10 BST
G2