How to get information about the I/O operations happening on an OSD?

Solution Verified - Updated -

Issue

  • How to get more information about the I/O operations happening on an OSD?

  • Is it possible to get details on the I/O operations which are shown as "blocked", in a Ceph cluster?

  • Is it possible to get information on the blocks I/O ops on each OSD, shown in the output of 'ceph health detail' or 'ceph -s'?

# ceph health detail
HEALTH_WARN 30 requests are blocked > 32 sec; 3 osds have slow requests
30 ops are blocked > 268435 sec
1 ops are blocked > 268435 sec on osd.11
1 ops are blocked > 268435 sec on osd.18
28 ops are blocked > 268435 sec on osd.39
3 osds have slow requests

Environment

  • Red Hat Ceph Storage 1.2.3

  • Red Hat Ceph Storage 1.3

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