Public bug reported:
Version: 0.48.2-0ubuntu2~cloud0
Our Ceph deployments typically involve multiple OSDs per host with no
disk redundancy. However the default crush rules appears to distribute
by OSD, not by host, which I believe will not prevent replicas from
landing on the same host.
I've been working around this by updating the crush rules as follows and
installing the resulting crushmap in the cluster, but since we aim for
fully automated deployment (using Juju and MaaS) this is suboptimal.
--- crushmap.txt 2013-01-10 20:33:21.265809301 +0000
+++ crushmap.new 2013-01-10 20:32:49.496745778 +0000
@@ -104,7 +104,7 @@
min_size 1
max_size 10
step take default
- step choose firstn 0 type osd
+ step chooseleaf firstn 0 type host
step emit
}
rule metadata {
@@ -113,7 +113,7 @@
min_size 1
max_size 10
step take default
- step choose firstn 0 type osd
+ step chooseleaf firstn 0 type host
step emit
}
rule rbd {
@@ -122,7 +122,7 @@
min_size 1
max_size 10
step take default
- step choose firstn 0 type osd
+ step chooseleaf firstn 0 type host
step emit
}
** Affects: cloud-archive
Importance: Undecided
Status: New
** Affects: ceph (Ubuntu)
Importance: Undecided
Status: New
** Tags: canonistack
** Also affects: ceph (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1098320
Title:
ceph: default crush rule does not suit multi-OSD deployments
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