Bug 1615440

Summary:	turn off brick multiplexing for stand alone RHGS
Product:	[Red Hat Storage] Red Hat Gluster Storage	Reporter:	Atin Mukherjee <amukherj>
Component:	core	Assignee:	Atin Mukherjee <amukherj>
Status:	CLOSED ERRATA	QA Contact:	Vinayak Papnoi <vpapnoi>
Severity:	high	Docs Contact:
Priority:	unspecified
Version:	rhgs-3.4	CC:	rcyriac, rhs-bugs, sankarshan, storage-qa-internal, vdas
Target Milestone:	---
Target Release:	RHGS 3.4.0
Hardware:	Unspecified
OS:	Unspecified
Whiteboard:
Fixed In Version:	glusterfs-3.12.2-16	Doc Type:	If docs needed, set a value
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2018-09-04 06:52:17 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:	1503132

Description Atin Mukherjee 2018-08-13 15:15:21 UTC

Description of problem:

brick multiplexing was enabled by default for RHGS 3.4.0 to ensure it gets exercised through the testing cycle and uncover important issues so that development can fix these well ahead of time to make it more stable.

At RHGS 3.4.0 testing phase there were few perf regressions identified (applicable to standlone RHGS but not OCS)


1. https://bugzilla.redhat.com/show_bug.cgi?id=1598056  (mkdir regression, seen in 24 * 3 volumes, but not in 1 * 3)
2. https://bugzilla.redhat.com/show_bug.cgi?id=1598424 (rmdir regression, seen in 24 * 3 volumes, but not in 1 * 3)
3. https://bugzilla.redhat.com/show_bug.cgi?id=1610658 - (CPU shoots up to 1900% during directory operation with 24 * 3 volumes, but not in 1 * 3)

So the decision was to continue having brick multiplexing enabled by default for OCS. This BZ is filed to ensure we turn this option off by default.

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


How reproducible:


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Additional info:

Comment 3 Vinayak Papnoi 2018-08-20 06:17:22 UTC

On (older) build version glusterfs-3.12.2-12.el7rhgs.x86_64 :

# gluster v get all all
Option                                  Value                                   
------                                  -----                                   
cluster.server-quorum-ratio             51                                      
cluster.enable-shared-storage           disable                                 
cluster.op-version                      31302                                   
cluster.max-op-version                  31302                                   
cluster.brick-multiplex                 enable                                  
cluster.max-bricks-per-process          0  


After performing upgrade to build glusterfs-3.12.2-16.el7rhgs.x86_64 :

# gluster v get all all
Option                                  Value                                   
------                                  -----                                   
cluster.server-quorum-ratio             51                                      
cluster.enable-shared-storage           disable                                 
cluster.op-version                      31302                                   
cluster.max-op-version                  31302                                   
cluster.brick-multiplex                 disable                                 
cluster.max-bricks-per-process          0                                       
cluster.daemon-log-level                INFO                                    


Brick-multiplexing is disabled by default in the build "glusterfs-3.12.2-16.el7rhgs.x86_64"

Hence, moving bug to VERIFIED.

Comment 5 errata-xmlrpc 2018-09-04 06:52:17 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/RHSA-2018:2607