How to calculate the optimal size for Ceph osd journal

Solution Verified - Updated -

Issue

  • How to calculate the optimal size for Ceph osd journal?
  • There formula below is listed in the Ceph documentation but what is the logic behind it?
osd journal size = 2 * (expected throughput * filestore max sync interval)

References: Ceph Storage - OSD configuration

Environment

  • Red Hat OpenStack Platform 13

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