[CentOS] Finding wich files a writen to

Marcelo Beckmann marcelobeckmann at bsd.com.br
Thu May 5 02:24:10 UTC 2011

2011/5/4 Nicolas Ross <rossnick-lists at cybercat.ca>:
> Hi !
> I have a server (Centos 5) that is using a pair of SAS drives to store the
> data. (Mail server) They are on an adaptec raid controler with a battery
> backup and write back cache active.
> >From time to time, I have sever peak io to those data disks (> 400 to 500
> iops, > 70 to 100 megs/sec).
> With iostat, I find that it's almost a write i/o problem. How can I find to
> which files the OS writes ? On OSX boxes, there is a utility called fs_usage
> that can reports any disk activity for a particular process or all
> processes. Is there any utility like this on Centos ?
> iotop can points me to wich process, but that doesn't points me to what
> files are the culprits...

I sugest a look for tools like this

it helps to make a script to watch file activities, and it uses a kernel feature

I discovered inotify some months ago when I looked into every
initscript in init.d

[23:13:35 root at gw init.d]# cat /etc/redhat-release
CentOS release 5.3 (Final)
[23:13:45 root at gw init.d]# head restorecond
# restorecond:          Daemon used to maintain path file context
# chkconfig:    2345 12 87
# description:  restorecond uses inotify to look for creation of new files \
# listed in the /etc/selinux/restorecond.conf file, and restores the \
# correct security context.

more about inotify:

What Is inotify?

inotify is a file change notification system—a kernel feature that
allows applications to request the monitoring of a set of files
against a list of events. When the event occurs, the application is
notified. To be useful, such a feature must be simple to use,
lightweight with little overhead and flexible. It should be easy to
add new watches and painless to receive notification of events.

More information about the CentOS mailing list