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Bug 1193682

Summary:	throughput-performance profile triggers hdparm commands on hotplug events
Product:	Red Hat Enterprise Linux 7	Reporter:	Scott Dodson <sdodson>
Component:	tuned	Assignee:	Jaroslav Škarvada <jskarvad>
Status:	CLOSED ERRATA	QA Contact:	Tereza Cerna <tcerna>
Severity:	unspecified	Docs Contact:
Priority:	unspecified
Version:	7.1	CC:	jeder, jscotka, jskarvad, tcerna
Target Milestone:	rc
Target Release:	---
Hardware:	Unspecified
OS:	Unspecified
Whiteboard:
Fixed In Version:	tuned-2.5.1-3.el7	Doc Type:	Bug Fix
Doc Text:	Cause: Previously hotplug events triggered by insertion of block devices could cause hdparm calls even if hdparm related settings aren't specified in Tuned profile. Consequence: APM and spindown settings of the newly attached rotary disks could be changed to non-requested values or related errors may be logged to Tuned log (e.g. if APM or spindown settings are not supported by the block device or hdparm package is not installed). Fix: The problem was that the hotplug event could initiate the code path for initialization of dynamic tuning even if the dynamic tuning was disabled. The code was fixed and now if the dynamic tuning is disabled the execution don't go the path for dynamic tuning. Result: Hdparm is now not called on hotplug events if dynamic tuning is disabled and hdparm related parameters are not set in the Tuned profile.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2015-11-19 12:21:42 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:

Description Scott Dodson 2015-02-17 21:29:01 UTC

This is forked from discussion in https://bugzilla.redhat.com/show_bug.cgi?id=1190654#c6

The throughput-performance profile triggers hdparm commands on hotplug events for loop0 devices like those triggered when creating docker containers in RHEL 7.1. This is in tuned-2.4.1.

(In reply to Jaroslav Škarvada from comment #5)
> > > u'/sys/devices/system/cpu/cpu0/cpufreq/scaling_available_governors'
> > > 2015-02-09 18:21:24,073 INFO     tuned.plugins.plugin_cpu: ignoring governor
> > > 'performance' on cpu 'cpu0', it is not supported
> > > 2015-02-09 18:21:24,076 ERROR    tuned.utils.commands: Executing cpupower
> > > error: analyzing CPU 1:
> > > 2015-02-09 18:21:24,076 ERROR    tuned.plugins.plugin_cpu: could not get
> > > current governor on cpu 'cpu1'
> > > 2015-02-09 18:21:24,077 ERROR    tuned.utils.commands: Reading
> > > /sys/devices/system/cpu/cpu1/cpufreq/scaling_available_governors error:
> > > [Errno 2] No such file or directory:
> > > u'/sys/devices/system/cpu/cpu1/cpufreq/scaling_available_governors'
> > > 2015-02-09 18:21:24,077 INFO     tuned.plugins.plugin_cpu: ignoring governor
> > > 'performance' on cpu 'cpu1', it is not supported
> > > 2015-02-09 18:21:26,525 INFO     tuned.plugins.hotplug: device 'dm-2' added
> > > 2015-02-09 18:21:26,526 INFO     tuned.plugins.hotplug: instance disk:
> > > adding new device dm-2
> > > 2015-02-09 18:21:26,628 ERROR    tuned.utils.commands: Executing hdparm
> > > error: [Errno 2] No such file or directory
> > 
> > > 2015-02-09 18:21:26,630 INFO     tuned.plugins.hotplug: device 'loop1' added
> > > 2015-02-09 18:21:26,630 INFO     tuned.plugins.hotplug: instance disk:
> > > adding new device loop1
> > > 2015-02-09 18:21:26,637 ERROR    tuned.utils.commands: Executing hdparm
> > > error: [Errno 2] No such file or directory
> > > 2015-02-09 18:21:26,638 INFO     tuned.plugins.hotplug: device 'loop0' added
> > > 2015-02-09 18:21:26,638 INFO     tuned.plugins.hotplug: instance disk:
> > > adding new device loop0
> > > 2015-02-09 18:21:26,648 ERROR    tuned.utils.commands: Executing hdparm
> > > error: [Errno 2] No such file or directory
> > 
> > hdparm is going to be a bit of a challenge.  It's harmless, but if I
> > remember correctly, the hotplug plugin was meant to automatically apply
> > tunings to newly attached SAN luns.  I don't have a sense of if anyone is
> > using that feature in the field, but perhaps we could disable it for
> > openshift?  Not sure that's appropriate either...
> >
> It seems it applies disk tuning for newly attached device. Not sure why it
> calls hdparm. Hdparm is used only in disk_plugin to set APM and spindown. It
> shouldn't be touched if 'apm' or 'spindown' parameters are not set in the
> profile. Do you set these parameters?

No, we're based off of throughput-performance though.

https://github.com/openshift/origin/blob/master/tuned/openshift-node/tuned.conf

Comment 2 Jaroslav Škarvada 2015-06-16 13:09:15 UTC

Upstream commit fixing this problem:
https://git.fedorahosted.org/cgit/tuned.git/commit/?id=6c155396eecc0258ad2429e44656f1664872d9f6

Comment 6 errata-xmlrpc 2015-11-19 12:21:42 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://rhn.redhat.com/errata/RHBA-2015-2375.html