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| -rw-r--r-- | doc/rados/troubleshooting/troubleshooting-pg.rst | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/doc/rados/troubleshooting/troubleshooting-pg.rst b/doc/rados/troubleshooting/troubleshooting-pg.rst index 7ea7a5ac02c..76a863138da 100644 --- a/doc/rados/troubleshooting/troubleshooting-pg.rst +++ b/doc/rados/troubleshooting/troubleshooting-pg.rst @@ -272,6 +272,18 @@ multiple of the number of OSDs. See `Placement Groups`_ for details. The default placement group count for pools isn't useful, but you can change it `here`_. +Can't Write Data +================ + +If your cluster is up, but some OSDs are down and you cannot write data, +check to ensure that you have the minimum number of OSDs running for the +placement group. If you don't have the minimum number of OSDs running, +Ceph will not allow you to write data because there is no guarantee +that Ceph can replicate your data. See ``osd pool default min size`` +in the `Pool, PG and CRUSH Config Reference`_ for details. + + .. _check: ../../operations/placement-groups#get-the-number-of-placement-groups .. _here: ../../configuration/pool-pg-config-ref .. _Placement Groups: ../../operations/placement-groups +.. _Pool, PG and CRUSH Config Reference: ../../configuration/pool-pg-config-ref
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