From: Andrew Schoen Date: Wed, 21 Oct 2020 15:55:46 +0000 (-0500) Subject: ceph-volume: remove mention of dmcache from docs and help text X-Git-Tag: v14.2.17~28^2~29^2~1 X-Git-Url: http://git-server-git.apps.pok.os.sepia.ceph.com/?a=commitdiff_plain;h=afc6c1792cf16b0d6fd197e155ef3f07938a8374;p=ceph.git ceph-volume: remove mention of dmcache from docs and help text With the introduction of bluestore dmcache is no longer needed and is no longer supported with `ceph-volume lvm`. Resolves: rhbz#1876827 Fixes: https://tracker.ceph.com/issues/48039 Signed-off-by: Andrew Schoen (cherry picked from commit ed5ceb04fc8ff57c5f7e2b5fa5e859c2cdbf2ffd) --- diff --git a/doc/ceph-volume/intro.rst b/doc/ceph-volume/intro.rst index c49531d55b3e..d59dd2b6c0f6 100644 --- a/doc/ceph-volume/intro.rst +++ b/doc/ceph-volume/intro.rst @@ -74,16 +74,11 @@ involved at all. ------------------- By making use of :term:`LVM tags`, the :ref:`ceph-volume-lvm` sub-command is able to store and later re-discover and query devices associated with OSDs so -that they can later activated. This includes support for lvm-based technologies -like dm-cache as well. - -For ``ceph-volume``, the use of dm-cache is transparent, there is no difference -for the tool, and it treats dm-cache like a plain logical volume. +that they can later be activated. LVM performance penalty ----------------------- In short: we haven't been able to notice any significant performance penalties associated with the change to LVM. By being able to work closely with LVM, the -ability to work with other device mapper technologies (for example ``dmcache``) -was a given: there is no technical difficulty in working with anything that can -sit below a Logical Volume. +ability to work with other device mapper technologies was a given: there is no +technical difficulty in working with anything that can sit below a Logical Volume. diff --git a/src/ceph-volume/ceph_volume/devices/lvm/main.py b/src/ceph-volume/ceph_volume/devices/lvm/main.py index f910baa82682..3ef3c1117d27 100644 --- a/src/ceph-volume/ceph_volume/devices/lvm/main.py +++ b/src/ceph-volume/ceph_volume/devices/lvm/main.py @@ -13,10 +13,10 @@ from . import batch class LVM(object): - help = 'Use LVM and LVM-based technologies like dmcache to deploy OSDs' + help = 'Use LVM and LVM-based technologies to deploy OSDs' _help = dedent(""" - Use LVM and LVM-based technologies like dmcache to deploy OSDs + Use LVM and LVM-based technologies to deploy OSDs {sub_help} """)