RHEL Disk I/O Performance Tunning

If you struggled to cope with disk I/O on virtual host machines which runs on Centos or RHEL, there is a great system performance tuning tool named TUNED, comes with different profiles.

for installing tuned;
#yum install tuned -y
starting the service permanently;
#service tuned start
#chkconfig tuned on
#    
#service ktune start
#chkconfig ktune on
status of running profile;
#tuned-adm active
list of profiles;
#tuned-adm list
setting the profile for disk I/O optimization;
#tuned-adm profile virtual-host
if you want to disable defined profile (i don’t thing you will consider this :);
#tuned-adm off
You are going to see significant optimization on atop tool. Here are tuned profile summary;
tunable default enterprise storage virtual host virtual guest latency performance throughput performance
kernel.sched min granularity ns 4ms 10ms 10ms 10ms   10ms
kernel.sched wakeup granularity ns 4ms 15ms 15ms 15ms   15ms
vm.dirty ratio 20%ram 40% 10% 40%   40%
vm.dirty background ratio 10% ram   5%      
vm.swappiness 60   10 30    
I/O Scheduler (Elevator) CFQ deadline deadline deadline deadline deadline
Filesystem Barriers On Off Off Off    
CPU Governor ondemand performance     performance performance
Disk Read-ahead   4x        
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