How to enable kernel module debug logging for rbd in RHCS ?

Solution Verified - Updated -

Issue

  • How to debug frequent i/o hung on rbd device from ceph perspective ?
  • How to determine if there is an issue with rbd device and whether issue is from ceph side ?

Environment

  • Red Hat Enterprise Linux 7.x
  • Red Hat Ceph Storage 2.x
  • Red Hat Ceph Storage 3.x

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