服务器总是每一小时Paging Activity(pgpgput/s), IO(reads/s和writes/s)很高,不知为什么?

难道是the culprit?
[loadtestiv@ydcrh07 ]$ ps -ef | grep 'vahi-daemon'
avahi     5065     1  0 Nov04 ?        00:00:00 avahi-daemon: running [localhost.local]
avahi     5066  5065  0 Nov04 ?        00:00:00 avahi-daemon: chroot helper
504      21069 20628  0 17:09 pts/2    00:00:00 grep vahi-daemon
fyi,
http://www.linuxquestions.org/questions/red-hat-31/horribly-high-pageout-rate-on-rhel-740547/