Bug 1279554 - Missing Ceph configuration options
Summary: Missing Ceph configuration options
Keywords:
Status: CLOSED ERRATA
Alias: None
Product: Red Hat OpenStack
Classification: Red Hat
Component: puppet-tripleo
Version: 7.0 (Kilo)
Hardware: Unspecified
OS: Unspecified
unspecified
unspecified
Target Milestone: rc
: 10.0 (Newton)
Assignee: Giulio Fidente
QA Contact: Yogev Rabl
URL:
Whiteboard:
Depends On:
Blocks: 1299836
TreeView+ depends on / blocked
 
Reported: 2015-11-09 17:35 UTC by Ben Nemec
Modified: 2016-12-14 15:16 UTC (History)
10 users (show)

Fixed In Version: puppet-tripleo-5.2.0-1.el7ost
Doc Type: Enhancement
Doc Text:
Using the RBD backend driver (Ceph Storage) for OpenStack Compute (nova) ephemeral disks applies two additional settings to libvirt: hw_disk_discard : unmap disk_cachemodes : network=writeback This allows reclaiming of unused blocks on the Ceph pool and caching of network writes, which improves the performance for OpenStack Compute ephemeral disks using the RBD driver. Also see http://docs.ceph.com/docs/master/rbd/rbd-openstack/
Clone Of:
: 1299836 (view as bug list)
Environment:
Last Closed: 2016-12-14 15:16:54 UTC


Attachments (Terms of Use)


Links
System ID Priority Status Summary Last Updated
Red Hat Product Errata RHEA-2016:2948 normal SHIPPED_LIVE Red Hat OpenStack Platform 10 enhancement update 2016-12-14 19:55:27 UTC
OpenStack gerrit 269561 None None None 2016-01-19 11:19:12 UTC

Description Ben Nemec 2015-11-09 17:35:44 UTC
Description of problem: According to the Ceph documentation at http://docs.ceph.com/docs/master/rbd/rbd-openstack/ there are some additional Nova options we should be setting when using Ceph as the backend.  I don't see any references to these params in our templates, so they were probably just missed in the initial Ceph implementation.

Two in particular that were noticed when documenting external Ceph are:

disk_cachemodes
hw_disk_discard

It doesn't seem that either of these are required for Ceph to function as the Nova backend, but it may be performing suboptimally when they're not set correctly.

Comment 3 Mike Burns 2016-04-07 20:57:01 UTC
This bug did not make the OSP 8.0 release.  It is being deferred to OSP 10.

Comment 5 Giulio Fidente 2016-07-19 11:09:37 UTC
Moving into POST as this was merged upstream

Comment 8 Yogev Rabl 2016-10-13 10:55:03 UTC
verified on puppet-tripleo-5.2.0-1.el7ost.noarch

Comment 10 errata-xmlrpc 2016-12-14 15:16:54 UTC
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://rhn.redhat.com/errata/RHEA-2016-2948.html


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