Bug 1001850

Summary:	Regression in large file sequential writes
Product:	Red Hat Gluster Storage	Reporter:	Anush Shetty <ashetty>
Component:	glusterfs	Assignee:	Bug Updates Notification Mailing List <rhs-bugs>
Status:	CLOSED EOL	QA Contact:	storage-qa-internal <storage-qa-internal>
Severity:	high	Docs Contact:
Priority:	unspecified
Version:	2.1	CC:	rhs-bugs, vbellur
Target Milestone:	---
Target Release:	---
Hardware:	Unspecified
OS:	Unspecified
Whiteboard:
Fixed In Version:		Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2015-12-03 17:11:59 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:

Description Anush Shetty 2013-08-28 00:58:10 UTC

Description of problem: We see a huge drop in performance while running large file sequential writes with iozone. This is in comparison with RHS 2.0


Version-Release number of selected component (if applicable): 3.4.0.20rhs-2.el6rhs


How reproducible: Always


Steps to Reproduce:
1. Create a 2x2 Distributed-Replicate volume
2. Mount 2 fuse clients
3. Run iozone in clustered mode with the options: -w -c -e -i 0 -+n -r 64k -s 1g -t 8

Actual results:

Avg Throughput values for writes from 3 Runs in Kbytes/sec

3.3.0.7rhs-1.el6rhs : 138077
3.4.0.20rhs-2.el6rhs : 90974


Expected results:

Results should be comparable to 2.0

Additional info:

Log files here: http://rhs-client2.lab.eng.blr.redhat.com/iozone/run21/

Comment 2 Anush Shetty 2013-08-28 02:10:55 UTC

Small correction, the size of the file was 10G and not 1G as mentioned under 'Steps to reproduce'. Apologies for the typo.

Comment 3 Anush Shetty 2013-08-28 03:05:18 UTC

We see a huge improvement in write throughput with 3.4.0.23rhs-1.el6rhs

With 3.4.0.20rhs-2.el6rhs: 90974 Kbytes/sec
With 3.4.0.23rhs-1.el6rhs: 117405 Kbytes/sec

Comment 4 Anush Shetty 2013-08-28 05:53:29 UTC

run6 - glusterfs - 3.3.0.7rhs-1.el6rhs - IOZONE - [-w -c -e -i 0 -+n -r 64k -s 10g -t 8] - distrep - (quota off, gsync off)
run21 - glusterfs - 3.4.0.20rhs-2.el6rhs - IOZONE - [-w -c -e -i 0 -+n -r 64k -s 10g -t 8] - distrep - (quota off, gsync off)
run23 - glusterfs - 3.4.0.23rhs-1.el6rhs - IOZONE - [-w -c -e -i 0 -+n -r 64k -s 10g -t 8] - distrep - (quota off, gsync off)
run25 - glusterfs - 3.4.0.24rhs-1.el6rhs - IOZONE - [-w -c -e -i 0 -+n -r 64k -s 10g -t 8] - distrep - (quota off, gsync off)

Operations                      RUN6    RUN21   RUN23   RUN25
-------------------------       ------- ------- ------- -------
write                           138077  90974   117405  98672
read                            194193  168711  165774  170840

Comment 5 Vivek Agarwal 2015-12-03 17:11:59 UTC

Thank you for submitting this issue for consideration in Red Hat Gluster Storage. The release for which you requested us to review, is now End of Life. Please See https://access.redhat.com/support/policy/updates/rhs/

If you can reproduce this bug against a currently maintained version of Red Hat Gluster Storage, please feel free to file a new report against the current release.