Note: This bug is displayed in read-only format because the product is no longer active in Red Hat Bugzilla.

Bug 1481821

Summary:	Ceph pg_num and pgp_num default is too low for any user
Product:	Red Hat OpenStack	Reporter:	Yogev Rabl <yrabl>
Component:	openstack-tripleo-heat-templates	Assignee:	Giulio Fidente <gfidente>
Status:	CLOSED ERRATA	QA Contact:	Yogev Rabl <yrabl>
Severity:	high	Docs Contact:
Priority:	high
Version:	10.0 (Newton)	CC:	dbecker, dhill, gfidente, jjoyce, jomurphy, lruzicka, mburns, morazi, rhel-osp-director-maint
Target Milestone:	z6	Keywords:	Reopened, Triaged, ZStream
Target Release:	10.0 (Newton)
Hardware:	x86_64
OS:	Linux
Whiteboard:
Fixed In Version:	openstack-tripleo-heat-templates-5.3.3-1.el7ost	Doc Type:	Known Issue
Doc Text:	The default value of `pg_num` and `pgp_num` has been set to 128 instead of 32. Consequently, the existing Ceph pools will be updated so that their `pg_num` and `pgp_num` changes to 128 and the data will be rebalanced on the OSDs. Customized values previously set in custom Heat environment files will be preserved. To keep `pg_num` and `pgp_num` set to their previous default values, add an extra environment file to the update or upgrade command. The command should have the following contents: parameter_defaults: ExtraConfig: ceph::profile::params::osd_pool_default_pg_num: 32 ceph::profile::params::osd_pool_default_pgp_num: 32	Story Points:	---
Clone Of:
Clones:	1489120 1489121 (view as bug list)		Environment:
Last Closed:	2018-01-04 13:27:18 UTC	Type:	Bug
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:
Bug Blocks:	1481685, 1489120, 1489121

Description Yogev Rabl 2017-08-15 19:38:33 UTC

Description of problem:
OSP director defaults set Ceph's pg_num and pgp_num to 32 which is too low. This will cause performance issues for any costumer that will use it.

Version-Release number of selected component (if applicable):


How reproducible:
100%

Steps to Reproduce:
1.
2.
3.

Actual results:
The pg_num and pgp_num for all the pools is 32

Expected results:
pg_num and pgp_num default should be 128, which is the right number for the minimum deployment of 3 OSDs in a cluster

Additional info:

Comment 1 Jeff Brown 2017-08-29 18:11:34 UTC

We need to set this to 128 by default. It will potentially overwritten by derived parameters or customers that  read the documentation.

Comment 4 Yogev Rabl 2017-11-07 18:04:46 UTC

verification passed: 
# ceph osd pool get volumes pg_num
pg_num: 128

rpm -qa |grep openstack-tripleo-heat-templates
openstack-tripleo-heat-templates-5.3.3-1.el7ost.noarch

grep ceph::profile::params::osd_pool_default_pg_num /usr/share/openstack-tripleo-heat-templates/ -r
/usr/share/openstack-tripleo-heat-templates/puppet/services/ceph-mon.yaml:            ceph::profile::params::osd_pool_default_pg_num: 128

Comment 6 errata-xmlrpc 2017-11-15 13:45:13 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://access.redhat.com/errata/RHBA-2017:3231