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Merge pull request #38604 from cybozu/doc-fix-the-meaning-of-min_size

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doc: fix the meaning of default_min_size of pools

Reviewed-by: Kefu Chai <kchai@redhat.com>
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Kefu Chai 2021-02-26 17:25:45 +08:00 committed by GitHub
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2 changed files with 6 additions and 6 deletions
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4
doc/rados/configuration/pool-pg-config-ref.rst
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@ -181,8 +181,8 @@ Ceph configuration file.
``osd_pool_default_min_size``
:Description: Sets the minimum number of written replicas for objects in the
pool in order to acknowledge a write operation to the client. If
minimum is not met, Ceph will not acknowledge the write to the
pool in order to acknowledge an I/O operation to the client. If
minimum is not met, Ceph will not acknowledge the I/O to the
client, **which may result in data loss**. This setting ensures
a minimum number of replicas when operating in ``degraded`` mode.

8
doc/rados/configuration/pool-pg.conf
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@ -3,12 +3,12 @@
# By default, Ceph makes 3 replicas of RADOS objects. If you want to maintain four
# copies of an object the default value--a primary copy and three replica
# copies--reset the default values as shown in 'osd_pool_default_size'.
# If you want to allow Ceph to write a lesser number of copies in a degraded
# state, set 'osd_pool_default_min_size' to a number less than the
# 'osd_pool_default_size' value.
# If you want to allow Ceph to accept an I/O operation to a degraded PG,
# set 'osd_pool_default_min_size' to a number less than the
# 'osd pool default size' value.
osd_pool_default_size = 3 # Write an object 3 times.
osd_pool_default_min_size = 2 # Allow writing two copies in a degraded state.
osd_pool_default_min size = 2 # Accept an I/O operation to a PG that has two copies of an object.
# Ensure you have a realistic number of placement groups. We recommend
# approximately 100 per OSD. E.g., total number of OSDs multiplied by 100