How do I control which devices are configured as WAL and DB devices when deploying Bluestore with OSPd?

Solution In Progress - Updated -

Issue

When generating the per-node OSD configuration, we look at the number of spinners and number of SSDs in each server. If there are either all spinners or all SSDs, we set osd_scenario to collocated. If there is a mix, we configure the spinners as OSD and the SSDs as journals, spreading the OSDs across the journals. If we have to specify "osd_scenario: lvm" to get bluestore, then where do we specify if we want collocated or non-collocated journals?

Environment

  • Red Hat OpenStack Platform
  • Red Hat Ceph Storage

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