[docs] document risk of combined ceph-osd

Bug #1425727 reported by Andrew Woodward
6
This bug affects 1 person
Affects Status Importance Assigned to Milestone
Fuel for OpenStack
Won't Fix
High
Svetlana Karslioglu

Bug Description

We need to convert the following to documentation about not combing OSD's with other workloads:

It is not recommended to mix OSD / Compute role:

http://ceph.com/docs/master/rados/troubleshooting/troubleshooting-osd/#co-resident-processes

In general, under memory pressure it might even lead to deadlock. Here
is a good explanation from Sage Weil (the Ceph lead developer):

http://permalink.gmane.org/gmane.comp.file-systems.ceph.devel/12005

Changed in fuel:
status: Confirmed → Triaged
Revision history for this message
Bogdan Dobrelya (bogdando) wrote :

Note we have this already in docs as known issue, https://docs.mirantis.com/openstack/fuel/fuel-6.0/release-notes.html#placing-ceph-osd-on-controller-nodes-is-not-recommended. IIRC, there was a note about it in reference architecture or planning guide, but I cannot find it anymore. Perhaps, this warning should be provided in the planning guide as well

Changed in fuel:
milestone: 6.1 → 8.0
Dmitry Pyzhov (dpyzhov)
tags: added: area-docs
Changed in fuel:
assignee: Fuel Documentation Team (fuel-docs) → Svetlana Karslioglu (skarslioglu)
Changed in fuel:
status: Triaged → Won't Fix
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