mirror of https://github.com/ceph/ceph
57 lines
1.9 KiB
ReStructuredText
57 lines
1.9 KiB
ReStructuredText
.. _ceph-volume-lvm-newdb:
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``new-db``
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===========
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Attaches the given logical volume to OSD as a DB.
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Logical volume name format is vg/lv. Fails if OSD has already got attached DB.
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Attach vgname/lvname as a DB volume to OSD 1::
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ceph-volume lvm new-db --osd-id 1 --osd-fsid 55BD4219-16A7-4037-BC20-0F158EFCC83D --target vgname/new_db
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Reversing BlueFS Spillover to Slow Devices
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------------------------------------------
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Under certain circumstances, OSD RocksDB databases spill onto slow storage and
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the Ceph cluster returns specifics regarding BlueFS spillover warnings. ``ceph
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health detail`` returns these spillover warnings. Here is an example of a
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spillover warning::
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osd.76 spilled over 128 KiB metadata from 'db' device (56 GiB used of 60 GiB) to slow device
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To move this DB metadata from the slower device to the faster device, take the
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following steps:
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#. Expand the database's logical volume (LV):
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.. prompt:: bash #
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lvextend -l ${size} ${lv}/${db} ${ssd_dev}
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#. Stop the OSD:
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.. prompt:: bash #
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cephadm unit --fsid $cid --name osd.${osd} stop
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#. Run the ``bluefs-bdev-expand`` command:
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.. prompt:: bash #
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cephadm shell --fsid $cid --name osd.${osd} -- ceph-bluestore-tool bluefs-bdev-expand --path /var/lib/ceph/osd/ceph-${osd}
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#. Run the ``bluefs-bdev-migrate`` command:
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.. prompt:: bash #
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cephadm shell --fsid $cid --name osd.${osd} -- ceph-bluestore-tool bluefs-bdev-migrate --path /var/lib/ceph/osd/ceph-${osd} --devs-source /var/lib/ceph/osd/ceph-${osd}/block --dev-target /var/lib/ceph/osd/ceph-${osd}/block.db
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#. Restart the OSD:
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.. prompt:: bash #
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cephadm unit --fsid $cid --name osd.${osd} start
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.. note:: *The above procedure was developed by Chris Dunlop on the [ceph-users] mailing list, and can be seen in its original context here:* `[ceph-users] Re: Fixing BlueFS spillover (pacific 16.2.14) <https://lists.ceph.io/hyperkitty/list/ceph-users@ceph.io/message/POPUFSZGXR3P2RPYPJ4WJ4HGHZ3QESF6/>`_
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