Ceph: Designing and Implementing Scalable Storage Systems

How to do it...

Let's run through some example uses for the ceph-objectstore-tool:

1. Find incomplete PGs on your Ceph cluster. Using this command, you can get the PG ID and its acting set:

        # ceph health detail | grep incomplete

2. Using the acting set, you can locate the OSD host:

        # ceph osd find <osd_number>

3. Log in to the OSD node and stop the OSD that you intend to work on:

         # systemctl stop ceph-osd@<id>

The following sections describe the OSD and placement group functions that you can use with the ceph-objectstore-tool:

1. To identify the objects within an OSD, execute the following. The tool will output all objects, irrespective of their placement groups:

        # ceph-objectstore-tool --data-path </path/to/osd>  --journal-path </path/to/journal> ...