From 3749ffe652f04a183165f69a2333e3f9c3c0f86c Mon Sep 17 00:00:00 2001 From: John Wilkins Date: Sat, 20 Apr 2013 11:08:08 -0700 Subject: [PATCH] doc: Added a scenario to PG troubleshooting. Signed-off-by: John Wilkins --- doc/rados/troubleshooting/troubleshooting-pg.rst | 12 ++++++++++++ 1 file changed, 12 insertions(+) diff --git a/doc/rados/troubleshooting/troubleshooting-pg.rst b/doc/rados/troubleshooting/troubleshooting-pg.rst index 7ea7a5ac02cae..76a863138da6e 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 \ No newline at end of file -- 2.39.5