From 3bae00a033878d2c1483e60579c85350b29153e4 Mon Sep 17 00:00:00 2001 From: Matt Boyle Date: Wed, 27 Sep 2017 11:11:23 +0100 Subject: [PATCH] doc: Fix typos in placement-groups.rst Signed-off-by: Matt Boyle --- doc/rados/operations/placement-groups.rst | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) diff --git a/doc/rados/operations/placement-groups.rst b/doc/rados/operations/placement-groups.rst index b0c6e329d62..dcff42bc5ca 100644 --- a/doc/rados/operations/placement-groups.rst +++ b/doc/rados/operations/placement-groups.rst @@ -118,9 +118,9 @@ permanent data loss in a single placement group: - The OSD fails and all copies of the object it contains are lost. For all objects within the placement group the number of replica - suddently drops from three to two. + suddenly drops from three to two. -- Ceph starts recovery for this placement group by chosing a new OSD +- Ceph starts recovery for this placement group by choosing a new OSD to re-create the third copy of all objects. - Another OSD, within the same placement group, fails before the new @@ -216,7 +216,7 @@ placement group, the ratio between the number of placement groups and the number of OSDs may influence the distribution of the data significantly. -For instance, if there was single a placement group for ten OSDs in a +For instance, if there was a single placement group for ten OSDs in a three replica pool, only three OSD would be used because CRUSH would have no other choice. When more placement groups are available, objects are more likely to be evenly spread among them. CRUSH also @@ -257,7 +257,7 @@ Choosing the number of Placement Groups If you have more than 50 OSDs, we recommend approximately 50-100 placement groups per OSD to balance out resource usage, data -durability and distribution. If you have less than 50 OSDs, chosing +durability and distribution. If you have less than 50 OSDs, choosing among the `preselection`_ above is best. For a single pool of objects, you can use the following formula to get a baseline:: -- 2.39.5