On 03/07/2014 11:43 PM, Indra Pramana wrote:
Hi Mariusz,
Good day to you, and thank you for your email.
>You should probably start by hooking up all servers into some kind of
statistics
>gathering software (we use collectd + graphite ) and monitor at least
disk stats
>(latency + iops + octets) and network.
Thank you for your recommendation on collectd + graphite. I have checked
and they just do the collection of the data and graph it, but what is
the tools to gather the data, especially the disk stats latency and
iops? What tools are recommended? I used iostat but it doesn't seem to
give much information. What parameters I need to lookout to check the
latency and iops?
If you are just looking for a simple command line tool, collectl is
pretty useful. I use it for all of my automated testing scripts.
apt-get install collectl
collectl -sD -oT
You can get quite a few other statistics from it as well including per
process statistics, slab memory, cpu, network, etc.
Mark
Looking forward to your reply, thank you.
Cheers.
On Sat, Mar 8, 2014 at 1:04 AM, Mariusz Gronczewski
<mariusz.gronczewski@xxxxxxxxxxxxx
<mailto:mariusz.gronczewski@xxxxxxxxxxxxx>> wrote:
On Fri, 7 Mar 2014 17:50:44 +0800, Indra Pramana <indra@xxxxxxxx
<mailto:indra@xxxxxxxx>> wrote:
>
> Any advice on how can I start to troubleshoot what might have
caused the
> degradation of the I/O speed? Does utilisation contributes to it
(since now
> we have more users compared to last time when we started)? Any
optimisation
> we can do to improve the I/O performance?
You should probably start by hooking up all servers into some kind
of statistics
gathering software (we use collectd + graphite ) and monitor at
least disk stats
(latency + iops + octets) and network.
Then it is much easier to see potential problems, for example we found
failing-but-not-yet-dead disks that sorta kinda worked but their
latency was 10x
higher than all other disks in machine.
Mariusz Gronczewski, Administrator
efigence S. A.
ul. Wołoska 9a, 02-583 Warszawa
T: [+48] 22 380 13 13 <tel:%5B%2B48%5D%2022%20380%2013%2013>
F: [+48] 22 380 13 14 <tel:%5B%2B48%5D%2022%20380%2013%2014>
E: mariusz.gronczewski@xxxxxxxxxxxx
<mailto:mariusz.gronczewski@xxxxxxxxxxxx>
<mailto:mariusz.gronczewski@xxxxxxxxxxxx
<mailto:mariusz.gronczewski@xxxxxxxxxxxx>>
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