Re: [CentOS] I/O size distribution?

2010-12-25 Thread Lucian
On Tue, Dec 21, 2010 at 10:01 PM, Antonello Piemonte apiem...@googlemail.com wrote: Hello I have read that under Solaris one can use DTrace to get I/O request size distribution on a global scale (also on a per process/pid basis). See for example

Re: [CentOS] I/O size distribution?

2010-12-23 Thread Antonello Piemonte
@ Charles Polisher yes, seems that avgrq-sz does provide the info I needed, thanks for pointing that out! @ Keith I am not sure if blktrace can monitor which files being written to disk or if it is the best tool for that. But you could check out the inotify-tools (iwatch and related) which go

Re: [CentOS] I/O size distribution?

2010-12-22 Thread Antonello Piemonte
Thanks for all the suggestions. I had a look at systemtap but I have the feeling that in it's current state it is aimed more at kernel developers rather than average admins like me :-) Still, I'll keep an eye on it also give the fact that there seem to be now new documentation being written

Re: [CentOS] I/O size distribution?

2010-12-22 Thread Keith Roberts
On Wed, 22 Dec 2010, Antonello Piemonte wrote: To: CentOS mailing list centos@centos.org From: Antonello Piemonte apiem...@googlemail.com Subject: Re: [CentOS] I/O size distribution? Thanks for all the suggestions. I had a look at systemtap but I have the feeling that in it's current

Re: [CentOS] I/O size distribution?

2010-12-22 Thread cpolish
Antonello Piemonte wrote: Hello I have read that under Solaris one can use DTrace to get I/O request size distribution on a global scale (also on a per process/pid basis). See for example http://prefetch.net/articles/observeiodtk.html Can anyone recommend an alternative to get similar

[CentOS] I/O size distribution?

2010-12-21 Thread Antonello Piemonte
Hello I have read that under Solaris one can use DTrace to get I/O request size distribution on a global scale (also on a per process/pid basis). See for example http://prefetch.net/articles/observeiodtk.html Can anyone recommend an alternative to get similar information under CentOS? I looked

Re: [CentOS] I/O size distribution?

2010-12-21 Thread Keith Roberts
On Tue, 21 Dec 2010, Antonello Piemonte wrote: To: centos@centos.org From: Antonello Piemonte apiem...@googlemail.com Subject: [CentOS] I/O size distribution? Hello I have read that under Solaris one can use DTrace to get I/O request size distribution on a global scale (also on a per process

Re: [CentOS] I/O size distribution?

2010-12-21 Thread JohnS
On Tue, 2010-12-21 at 23:01 +0100, Antonello Piemonte wrote: Hello IOTOP from here [1]. From a very quick glance of the Specfile it should build with no problems under EL5. John [1] http://guichaz.free.fr/iotop/ ___ CentOS mailing list

Re: [CentOS] I/O size distribution?

2010-12-21 Thread Jeff Layton
On 12/21/2010 05:01 PM, Antonello Piemonte wrote: Hello I have read that under Solaris one can use DTrace to get I/O request size distribution on a global scale (also on a per process/pid basis). See for example http://prefetch.net/articles/observeiodtk.html Can anyone recommend an

Re: [CentOS] I/O size distribution?

2010-12-21 Thread Geoff Galitz
.. I have read that under Solaris one can use DTrace to get I/O request size distribution on a global scale (also on a per process/pid basis). See for example http://prefetch.net/articles/observeiodtk.html Can anyone recommend an alternative to get similar information under CentOS? I