CentOS I/O blocking flushing dirtypages

Posted by user3662224 on Server Fault See other posts from Server Fault or by user3662224
Published on 2014-05-28T21:23:50Z Indexed on 2014/05/28 21:31 UTC
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Filed under:

apache-2.2

|

centos

|

php

I have an Apache webserver on CentOS. It is not doing anything fantastic or complicated at all but it does at intervals experience a high load (120 for 4 CPUs) for some reason. During this time I see high waits and write durations. I have narrowed this down to flushing of dirtypages to disk to make room for new data.

I have tried many things and talked to the developers who are also puzzled by this. I am stumped.

Details: vmware virtual guest server 4 cpus 12G RAM Apache PHP

I have 40 servers in this cluster that share the same disk structure. Only the webservers are experiencing this issue.

Any ideas?

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