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“tuned” on RHEL/CentOS/Fedora

Starting with RHEL 6 ( and thus also with CentOS 6 ) Red Hat users have possibility to use tuned tool which gives possibility to activate different tuned profiles for RHEL 6 running server.

So what is tuned? ‘yum info tuned’ gives below

# yum info tuned

Description : The tuned package contains a daemon that tunes system settings
: dynamically. It does so by monitoring the usage of several system
: components periodically. Based on that information components will
: then be put into lower or higher power saving modes to adapt to
: the current usage. Currently only ethernet network and ATA
: harddisk devices are implemented.

As description above says,tuned provide daemon to tune system settings dynamically.After installation with

# yum install tuned

in /etc/tune-profiles you will find 9 different profiles designed for different situations.These profiles are

default
desktop-powersave
enterprise-storage
laptop-ac-powersave
laptop-battery-powersave
latency-performance
server-powersave
spindown-disk
throughput-performance

Above default profiles are self descriptive,and if you want to use some of these on your server,I think interesting ones would be

enterprise-storage
latency-performance
server-powersave
throughput-performance

enterprise-storage will configure system parameters which will correspond enterprise class storages – important to mention,it will disable barriers,so not recommended to use it when storage systems do not have battery which prevent data loss in case of power failure

latency-performance is profile designed to provide minimum ( network stack) latency for server.I will edit and adapt parameters related to tpc/udp in /proc/net,do not expect some great magic to happen when switching from default configuration to latency-performance profile

server-powersave is designed with power saving in mind,and in my opinion directed to desktops,not sure why name of profile is server-powersave

throughput-performance will do almost same thing as enterprise-storage but will leave enabled barriers. Recommended is to use it when storage solution is not equipped with battery which prevents data protection in case of power failure

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