Re: Hard disk I/O

[Igor Cicimov <icicimov@xxxxxxxxx>]

Hmmm that's a pretty bad disk read I would expect this to be around 100MB/s on production system or at least 2-3 times higher. What is apache version and what kind of hardware is running on? What is the output of the iostat command showing? Any errors in the apache or moodle logs? Can you also post the relevant moodle config in apache? Did you check the memory, disk space and cpu stats (vmstat,df,top,iostat,sar etc)

On Thu, Nov 17, 2011 at 9:15 PM, Josu Lazkano <josu.lazkano@xxxxxxxxxxxxxxxxxx> wrote:

Hello list, I am having lots of problem with apache2 and Moodle, it
takes 100% of CPU and it block my server. I ask on moodle forum, I try
to install PHP-APC to cache PHP process but there is no good result.

I check my disk timing and this is:

$ sudo hdparm -tT /dev/sda

/dev/sda:
 Timing cached reads:   12086 MB in  1.99 seconds = 6068.06 MB/sec
 Timing buffered disk reads:   72 MB in  3.05 seconds =  23.64 MB/sec

This is on a ESX virtual machine, are this values well?

I don't know how to solve this, with 15-20 simultaneous users I get 100%
CPU and I must reboot the server.

Any idea about this?

I will appreciate your help.

Best regards.


--
Josu Lazkano
Barcelona Media – Centre d’Innovació


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