Ceph: Designing and Implementing Scalable Storage Systems

RADOS bench

To use Ceph's built-in tool, first create a dedicated, disposable pool to scribble into. For this to be a legitimate test, it must have the same attributes as your production pool: PG count, replication factor, CRUSH rules, etc.

Options to rados bench include:

• -p: The name of our dedicated test pool
• seconds: Number of seconds the test should run
• write|seq|rand: Type of workload to present: write, sequential read, random read
• -t: Number of concurrent operations; the default is 16
• --no-cleanup: Don't clean up the objects created during the run

Let's run a 60-second write test against a small cluster with a pool named data. A dedicated pool should be used to ensure that user data is not clobbered. Longer tests are better than shorter, ...