From: John Wilkins Date: Sat, 20 Apr 2013 18:08:08 +0000 (-0700) Subject: doc: Added a scenario to PG troubleshooting. X-Git-Tag: v0.61~133 X-Git-Url: http://git-server-git.apps.pok.os.sepia.ceph.com/?a=commitdiff_plain;h=3749ffe652f04a183165f69a2333e3f9c3c0f86c;p=ceph.git doc: Added a scenario to PG troubleshooting. Signed-off-by: John Wilkins --- diff --git a/doc/rados/troubleshooting/troubleshooting-pg.rst b/doc/rados/troubleshooting/troubleshooting-pg.rst index 7ea7a5ac02ca..76a863138da6 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