Adding OSDs

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Use this information to deploy OSDs on a specific device or host.

Cephadm does not provision an OSD on a device that is not available. A storage device is considered available if it meets all of the following conditions:

  • The device must have no partitions.

  • The device must not be mounted.

  • The device must not contain a file system.

  • The device must not contain a Ceph BlueStore OSD.

  • The device must be larger than 5 GB.

Important: By default, the osd_memory_target_autotune parameter is set to true in IBM Storage Ceph.

For information about tuning OSD memory automatically, see Automatically tuning OSD memory.

Prerequisites

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  • A running IBM Storage Ceph cluster.

Procedure

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  1. List the available devices to deploy OSDs:

    Syntax 

    ceph orch device ls [--hostname=HOSTNAME1 HOSTNAME2] [--wide] [--refresh]

    Example 

    [ceph: root@host01 /]# ceph orch device ls --wide --refresh

  2. You can either deploy the OSDs on specific hosts or on all the available devices:

    • To create an OSD from a specific device on a specific host:

      Syntax 

      ceph orch daemon add osd HOSTNAME:DEVICE_PATH

      Example 

      [ceph: root@host01 /]# ceph orch daemon add osd host02:/dev/sdb

    • To deploy OSDs on any available and unused devices, use the --all-available-devices option.

      Example 

      [ceph: root@host01 /]# ceph orch apply osd --all-available-devices
      Note: This command creates colocated WAL and DB daemons. If you want to create non-colocated daemons, do not use this command.