Re: Possible to put some sort of qos/rate-limit on glusterfsd?

[Fabio Rosati <fabio.rosati@xxxxxxxxxxxxxxxxx>]

Ok I look forward to read something about it from you. In the meantime may you give us some other detail? Did you limit only the glusterfsd daemon?

Doing so we can limit the replica process but NOT the access to the volume from clients?

Thank you

Fabio

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Da: "Andrew Lau" <andrew@xxxxxxxxxxxxxx>
A: "James" <purpleidea@xxxxxxxxx>
Cc: "gluster-users@xxxxxxxxxxx List" <gluster-users@xxxxxxxxxxx>
Inviato: Lunedì, 3 febbraio 2014 11:25:45
Oggetto: Re: [Gluster-users] Possible to put some sort of qos/rate-limit on        glusterfsd?

Quick update, I've successfully got glusterfs running with cgroups and I'm very impressed with the results.

I'll write something up in the coming days - thanks again for the suggestion.

On Mon, Feb 3, 2014 at 11:48 AM, Andrew Lau <andrew@xxxxxxxxxxxxxx> wrote:

Thanks for the suggestions - I'm seeing some promising results with cgroups. 

Just for confirmation - am I right in saying glusterd is just the management daemon? and glusterfsd is the actual process which does the checksums, replication, healing etc?

On Mon, Feb 3, 2014 at 10:18 AM, Dan Mons <dmons@xxxxxxxxxxxxxxxxxx> wrote:

Try experimenting with performance.io-thread-count to see if that has an impact.

-Dan
----------------
Dan Mons
Skunk Works
Cutting Edge
http://cuttingedge.com.au

On 2 February 2014 15:46, Andrew Lau <andrew@xxxxxxxxxxxxxx> wrote:
> Hi all,
>
> Sadly my google skills aren't finding me any results - is there an option to
> limit the CPU usage and/or the disk IO intensity of glusterfsd.
>
> Example scenario, oVirt + gluster on the same host when it comes to adding
> an extra host + replicated brick the original host with the brick goes crazy
> with 500% cpu as it copies just under 1TB of data across to the new
> replicated brick. Going crazy I mean everything else will hang, simple "ls"
> command will take 30+ seconds.
>
> Limiting the network bandwidth to 200Mbps seems to solve this issue, I'm
> quite sure this is a CPU issue rather than IO so I was wondering if there's
> any possibility to limit this down so the nic's itself don't have to get
> rate limited.
>
> Thanks,
> Andrew
>

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