Bug 1092308 – backport diskio device filtering

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Bug 1092308 - backport diskio device filtering

Summary:	backport diskio device filtering

Status:	CLOSED ERRATA

Aliases:	None

Product:	Red Hat Enterprise Linux 7
Classification:	Red Hat
Component:	net-snmp (Show other bugs)
Sub Component:
Version:	7.0
Hardware:	Unspecified Unspecified

Priority	high Severity medium
Target Milestone:	rc
Target Release:	---
Assigned To:	Jan Safranek
QA Contact:	Dalibor Pospíšil
Docs Contact:

URL:
Whiteboard:
Keywords:

Depends On:
Blocks:
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Reported:	2014-04-29 02:01 EDT by Karel Srot
Modified:	2015-11-19 06:45 EST (History)
CC List:	1 user (show)

See Also:
Fixed In Version:	net-snmp-5.7.2-24.el7
Doc Type:	Bug Fix
Doc Text:	The snmpd service parses the /proc/diskstats file to track disk usage statistics for UCD-DISKIO-MIB::diskIOTable. On systems with a large number of block devices, /proc/diskstats may be large in size and parsing it can take a non-trivial amount of CPU time. With this update, Net-SNMP introduces a new option, 'diskio', in the etc/snmp/snmpd.conf file, which can be used to explicitly specify devices that should be monitored. Only these whitelisted devices are then reported in UCD-DISKIO-MIB::diskIOTable, thus speeding up snmpd on systems with numerous block devices.
Story Points:	---
Clone Of:
Environment:
Last Closed:	2015-11-19 06:45:37 EST
Type:	Bug
Regression:	---
Mount Type:	---
Documentation:	---
CRM:
Verified Versions:
Category:	---
oVirt Team:	---
RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---

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External Trackers
Tracker	ID	Priority	Status	Summary	Last Updated
Red Hat Product Errata	RHSA-2015:2345	normal	SHIPPED_LIVE	Moderate: net-snmp security and bug fix update	2015-11-19 05:30:06 EST

Groups: None (edit)

Description Karel Srot 2014-04-29 02:01:27 EDT

Description of problem:

diskio device filtering has been already implemented in RHEL-6 as bug 990674,
upstream git commit 5be210c90870ff6bab193d497d401b92c1d50db9.

the Net-SNMP daemon, parses /proc/diskstats to track disk usage statistics for UCD-DISKIO-MIB::diskIOTable. On machines with large number of block devices, this /proc/diskstats is large and its parsing can take non-trivial amount of CPU. With this update, Net-SNMP introduces new option 'diskio' in /etc/snmp/snmpd.conf, which can be used to specify devices, which should be monitored. Only these whitelisted devices are then reported in UCD-DISKIO-MIB::diskIOTable, thus speeding up snmpd on systems with lot of block devices.

Please backport also to RHEL-7 so we don't regress.

Comment 7 errata-xmlrpc 2015-11-19 06:45:37 EST

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/RHSA-2015-2345.html

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