Hi Ben,
Thanks for the help. The workload is a typical ETL processing. Building a DataWarehouse. I'll get you the rest of that information as soon as I can the tip about the metadata is already very interesting.
Thanks,
Erik
On Fri, Feb 22, 2013 at 9:25 PM, Ben Myers <bpm@xxxxxxx> wrote:
Hi Erik,
AIL stands for Active Item List. These guys sync metadata which has been
On Fri, Feb 22, 2013 at 02:04:17PM +0100, Erik Knight wrote:
> We've recently noticed that our system is experiencing extreme performance
> problems when running large workloads. The problem seems to come from
> excessive System CPU time. Specifically dozens of xfsaild threads. We used
> to have SSD drives but recently switched to HDD, so some of us are thinking
> that there may be a configuration issue within XFS that is optimized for
> SSD but performs terribly slow on HDD.
>
> Can anyone explain what these threads do, what would cause so many of them
> to be running simultaneously or consume so much CPU?
logged to its final location on disk. You'll have one daemon per filesystem.
If you have a very metadata intensive workload they could get a workout. It
would help to know a bit more about your workload and configuration. Can you
provide the relevant information listed here?
http://www.xfs.org/index.php/XFS_FAQ#Q:_What_information_should_I_include_when_reporting_a_problem.3F
Regards,
Ben
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