2017-10-03 15:36:06 +00:00
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.. _ceph-volume-lvm-list:
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``list``
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========
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This subcommand will list any devices (logical and physical) that may be
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associated with a Ceph cluster, as long as they contain enough metadata to
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allow for that discovery.
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Output is grouped by the OSD ID associated with the devices, and unlike
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``ceph-disk`` it does not provide any information for devices that aren't
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associated with Ceph.
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Command line options:
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* ``--format`` Allows a ``json`` or ``pretty`` value. Defaults to ``pretty``
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which will group the device information in a human-readable format.
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Full Reporting
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--------------
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When no positional arguments are used, a full reporting will be presented. This
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means that all devices and logical volumes found in the system will be
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displayed.
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Full ``pretty`` reporting for two OSDs, one with a lv as a journal, and another
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one with a physical device may look similar to::
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# ceph-volume lvm list
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====== osd.1 =======
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[journal] /dev/journals/journal1
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journal uuid C65n7d-B1gy-cqX3-vZKY-ZoE0-IEYM-HnIJzs
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osd id 1
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cluster fsid ce454d91-d748-4751-a318-ff7f7aa18ffd
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type journal
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osd fsid 661b24f8-e062-482b-8110-826ffe7f13fa
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data uuid SlEgHe-jX1H-QBQk-Sce0-RUls-8KlY-g8HgcZ
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journal device /dev/journals/journal1
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data device /dev/test_group/data-lv2
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2018-04-25 14:48:45 +00:00
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devices /dev/sda
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[data] /dev/test_group/data-lv2
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journal uuid C65n7d-B1gy-cqX3-vZKY-ZoE0-IEYM-HnIJzs
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osd id 1
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cluster fsid ce454d91-d748-4751-a318-ff7f7aa18ffd
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type data
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osd fsid 661b24f8-e062-482b-8110-826ffe7f13fa
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data uuid SlEgHe-jX1H-QBQk-Sce0-RUls-8KlY-g8HgcZ
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journal device /dev/journals/journal1
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data device /dev/test_group/data-lv2
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2018-04-25 14:48:45 +00:00
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devices /dev/sdb
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2017-10-03 15:36:06 +00:00
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====== osd.0 =======
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[data] /dev/test_group/data-lv1
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journal uuid cd72bd28-002a-48da-bdf6-d5b993e84f3f
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osd id 0
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cluster fsid ce454d91-d748-4751-a318-ff7f7aa18ffd
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type data
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osd fsid 943949f0-ce37-47ca-a33c-3413d46ee9ec
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data uuid TUpfel-Q5ZT-eFph-bdGW-SiNW-l0ag-f5kh00
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journal device /dev/sdd1
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data device /dev/test_group/data-lv1
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devices /dev/sdc
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[journal] /dev/sdd1
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PARTUUID cd72bd28-002a-48da-bdf6-d5b993e84f3f
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2018-04-25 14:48:45 +00:00
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For logical volumes the ``devices`` key is populated with the physical devices
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associated with the logical volume. Since LVM allows multiple physical devices
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to be part of a logical volume, the value will be comma separated when using
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``pretty``, but an array when using ``json``.
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2017-10-03 15:36:06 +00:00
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.. note:: Tags are displayed in a readable format. The ``osd id`` key is stored
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as a ``ceph.osd_id`` tag. For more information on lvm tag conventions
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see :ref:`ceph-volume-lvm-tag-api`
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Single Reporting
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----------------
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Single reporting can consume both devices and logical volumes as input
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(positional parameters). For logical volumes, it is required to use the group
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name as well as the logical volume name.
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For example the ``data-lv2`` logical volume, in the ``test_group`` volume group
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can be listed in the following way::
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# ceph-volume lvm list test_group/data-lv2
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====== osd.1 =======
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[data] /dev/test_group/data-lv2
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journal uuid C65n7d-B1gy-cqX3-vZKY-ZoE0-IEYM-HnIJzs
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osd id 1
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cluster fsid ce454d91-d748-4751-a318-ff7f7aa18ffd
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type data
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osd fsid 661b24f8-e062-482b-8110-826ffe7f13fa
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data uuid SlEgHe-jX1H-QBQk-Sce0-RUls-8KlY-g8HgcZ
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journal device /dev/journals/journal1
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data device /dev/test_group/data-lv2
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devices /dev/sdc
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2017-10-03 15:36:06 +00:00
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.. note:: Tags are displayed in a readable format. The ``osd id`` key is stored
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as a ``ceph.osd_id`` tag. For more information on lvm tag conventions
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see :ref:`ceph-volume-lvm-tag-api`
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For plain disks, the full path to the device is required. For example, for
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a device like ``/dev/sdd1`` it can look like::
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# ceph-volume lvm list /dev/sdd1
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====== osd.0 =======
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[journal] /dev/sdd1
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PARTUUID cd72bd28-002a-48da-bdf6-d5b993e84f3f
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``json`` output
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---------------
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All output using ``--format=json`` will show everything the system has stored
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as metadata for the devices, including tags.
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No changes for readability are done with ``json`` reporting, and all
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information is presented as-is. Full output as well as single devices can be
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listed.
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For brevity, this is how a single logical volume would look with ``json``
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output (note how tags aren't modified)::
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# ceph-volume lvm list --format=json test_group/data-lv1
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{
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"0": [
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{
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"devices": ["/dev/sda"],
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"lv_name": "data-lv1",
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"lv_path": "/dev/test_group/data-lv1",
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"lv_tags": "ceph.cluster_fsid=ce454d91-d748-4751-a318-ff7f7aa18ffd,ceph.data_device=/dev/test_group/data-lv1,ceph.data_uuid=TUpfel-Q5ZT-eFph-bdGW-SiNW-l0ag-f5kh00,ceph.journal_device=/dev/sdd1,ceph.journal_uuid=cd72bd28-002a-48da-bdf6-d5b993e84f3f,ceph.osd_fsid=943949f0-ce37-47ca-a33c-3413d46ee9ec,ceph.osd_id=0,ceph.type=data",
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"lv_uuid": "TUpfel-Q5ZT-eFph-bdGW-SiNW-l0ag-f5kh00",
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"name": "data-lv1",
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"path": "/dev/test_group/data-lv1",
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"tags": {
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"ceph.cluster_fsid": "ce454d91-d748-4751-a318-ff7f7aa18ffd",
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"ceph.data_device": "/dev/test_group/data-lv1",
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"ceph.data_uuid": "TUpfel-Q5ZT-eFph-bdGW-SiNW-l0ag-f5kh00",
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"ceph.journal_device": "/dev/sdd1",
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"ceph.journal_uuid": "cd72bd28-002a-48da-bdf6-d5b993e84f3f",
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"ceph.osd_fsid": "943949f0-ce37-47ca-a33c-3413d46ee9ec",
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"ceph.osd_id": "0",
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"ceph.type": "data"
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},
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"type": "data",
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"vg_name": "test_group"
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}
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]
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}
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Synchronized information
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------------------------
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Before any listing type, the lvm API is queried to ensure that physical devices
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that may be in use haven't changed naming. It is possible that non-persistent
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devices like ``/dev/sda1`` could change to ``/dev/sdb1``.
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The detection is possible because the ``PARTUUID`` is stored as part of the
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metadata in the logical volume for the data lv. Even in the case of a journal
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that is a physical device, this information is still stored on the data logical
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volume associated with it.
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If the name is no longer the same (as reported by ``blkid`` when using the
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``PARTUUID``), the tag will get updated and the report will use the newly
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refreshed information.
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