Re: [CentOS] Very slow disk I/O

On 01/28/2015 01:32 PM, Jatin Davey wrote:

Hi Users

I am using RHEL 6.5 on my server.

From top command i can see that the processors in my server are spending a lot of time on wait for I/O. I can see high percentage in terms of 30-50% on "wa" time.

Here is the df output about the disk space in my system:

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[root@localhost images]# df Filesystem 1K-blocks Used Available Use% Mounted on /dev/sda1 1915071844 103227908 1714563936 6% / tmpfs 32931472 0 32931472 0% /dev/shm

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Could someone point me on how to improve the disk I/O on my server and reduce the wait time on I/O.

you could use iotop or vmstat to see what processes are causing the IO.