MD BMG/Usecases

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  • mdtest: test file MD operations on MDS: open, create, lookups, readdir; used in academia and as a comparison tool of FS MD.
  • fstest: small I/O’s and small files as well as lookups, targeting both MDS and OSS operations and MD HA for multiple MDS’s.
  • Postmark: old NetApp benchmark – I built an MPI version; it is used to measure MD operations and file size scalability and files per directory scalability.
  • Netmist: used to model any workload from statistics including all MD operations and file operations. Can model Workload objects for I/O performance mixes and combination of I/O and MD. Suitable for initial evaluation of storage as well as for performance troubleshooting.

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