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Learning Ceph - Second Edition by Karan Singh, Vaibhav Bhembre, Anthony D'Atri

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OSD dump

The ceph osd dump command shows a wealth of lower-level information about our clusters. This includes a list of pools with their attributes and a list of OSDs each including reweight adjustment, up/in status, and more. This command is mostly used in unusual troubleshooting situations.

    # ceph osd dump | head
    epoch 33291
    fsid 3369c9c6-bfaf-4114-9c31-ncc17014d0fe
    created 2017-09-06 20:21:06.448220
    modified 2017-09-17 21:38:44.530321
    flags sortbitwise,require_jewel_osds
    pool 1 'rbd' replicated size 3 min_size 2 crush_ruleset 0 object_hash rjenkins pg_num 16384 pgp_num 16384 last_change 31616 flags hashpspool,nodelete,nopgchange,nosizechange stripe_width 0
          removed_snaps [1~3]
    max_osd 287
    osd.0 up in weight 1 up_from 31886 up_thru 33113 ...

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