Bug 881614

Summary: Set default block io scheduler
Product: [oVirt] ovirt-host-deploy Reporter: Alon Bar-Lev <alonbl>
Component: Plugins.tuneAssignee: Alon Bar-Lev <alonbl>
Status: CLOSED DUPLICATE QA Contact: Pavel Stehlik <pstehlik>
Severity: unspecified Docs Contact:
Priority: unspecified    
Version: ---CC: bazulay, dougsland, iheim, Rhev-m-bugs, yeylon, ykaul
Target Milestone: ---Keywords: Improvement
Target Release: ---   
Hardware: Unspecified   
OS: Unspecified   
Whiteboard: Infra
Fixed In Version: Doc Type: Enhancement
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: 2012-12-03 17:34:45 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: 754334, 866889, 878511    
Bug Blocks:    

Description Alon Bar-Lev 2012-11-29 08:21:42 UTC 
Up until now the default io scheduler was set in kernel arguments.
This is dangerous, intrusive, unportable and indeterministic.

bug#754334 added tuned dependency which should have done exactly this, but as it turns out (bug#878511) it does not applies the policy dynamically.

So we need some solution within vdsm or bootstrap. A solution for vdsm is available at[1].

But as tuned entered the picture it may be wiser to perform this at bootstrap level, dropping it when tuned is ready.

[1] http://gerrit.ovirt.org/#/c/8700/
Comment 1 Alon Bar-Lev 2012-12-03 17:34:45 UTC 

*** This bug has been marked as a duplicate of bug 870159 ***