Bug 1788656 - [Disperse volume]: Regression in IO performance seen in sequential read for large file
Summary: [Disperse volume]: Regression in IO performance seen in sequential read for l...
Keywords:
Status: CLOSED ERRATA
Alias: None
Product: Red Hat Gluster Storage
Classification: Red Hat Storage
Component: read-ahead
Version: rhgs-3.5
Hardware: x86_64
OS: Linux
high
high
Target Milestone: ---
: RHGS 3.5.z Batch Update 1
Assignee: Ashish Pandey
QA Contact: Mugdha Soni
URL:
Whiteboard:
Depends On: 1735666
Blocks: 1696815
TreeView+ depends on / blocked
 
Reported: 2020-01-07 17:33 UTC by Ashish Pandey
Modified: 2020-08-04 12:16 UTC (History)
15 users (show)

Fixed In Version: glusterfs-6.0-26
Doc Type: Bug Fix
Doc Text:
Performance translators, 'io-cache' and 'read-ahead' were not adding any performance improvement. The 'read-ahead' is redundant due to kernel 'read-ahead' and 'io-cache' was degrading the performance for workloads that don’t involve re-read. As the VFS layer already has both these functionalities, the two translators have been turned off by default for native fuse mounts. Due to this, there is improved performance for the sequential read.
Clone Of: 1735666
Environment:
Last Closed: 2020-01-30 06:42:48 UTC
Embargoed:
pprakash: needinfo-

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System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHBA-2020:0288 0 None None None 2020-01-30 06:43:08 UTC

Comment 22 Mugdha Soni 2020-01-27 10:37:36 UTC 
The following steps were performed.
1. No new failures were seen in the automated regression suite after  the perf translators io-cache and read-ahead have been turned off.
2. Created all volume types and mounted the volume .
3. Validated the fuse vol and no read-ahead, io-cache translator is loaded.
    gluster vol get <volname> all  | grep 'read-ahead'
    gluster vol get <volname> all  | grep 'io-cache'

These translators were disabled .

Hence moving the bug to verified state.
Comment 23 Anjana KD 2020-01-29 17:30:08 UTC 
have updated the doc text kindly verify the doc text- field.
Comment 26 errata-xmlrpc 2020-01-30 06:42:48 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-2020:0288
Comment 27 Mugdha Soni 2020-08-04 12:16:30 UTC 
Based on the comment#17 and comment#19 i clear the need info on me .
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