[Devel] Re: [Question] I have questions about dm-ioband

[Ryo Tsuruta]

Hi Dong-Jae,

From: "Dong-Jae Kang" <baramsori72 at gmail.com>
Subject: [Question] I have questions about dm-ioband
Date: Fri, 7 Nov 2008 14:39:56 +0900

> Hi, Ryo tsuruta
> 
> During past several days, I had been analyzing and testing your
> dm-ioband I/O controller.
> because I received some requirements about disk I/O control from other
> persons as below
> "guaranteeing the minimum BW of processes in the specific group", of
> course, in the total BW range.
> I think it can be adjusted to streaming service, SLA of service
> hosting part and so on.
> although the applicable area is some specific and limited part, it can
> be useful according to the service
> How do you think about upper requirement?

I think I know why they want minimum bandwidth guarantee and it
would be useful on a certain situation.

> If it is required, I think that try to support the function in your
> dm-ioband controller
> personally, I like your design and implementation style.
> And, for it , where is the appropriate part in dm-ioband controller to
> implement the function?
> Can you give me some advice and comments about supporting it ?

Sure! dm-ioband is designed to be able to add new bandwidth control
policies. dm-ioband-policy.c is a source code of "weight" and
"weight-iosize" policies, and would help to understand how to add
a new policy.

> I don't know well about the details of dm-ioband controllers, concept,
> design, architecture and so on.
> it will take some time for me to do that ^^
> Well, Is there any documentations to help for me to understand the
> existing implementation ?
> If so, can I refer it ?

Sorry, there is no document which describes the implementation.

> additional one question is left^^
> dm-ioband can be operated with another dm targets at the same thme?
> with such like multipath, mirror, linear, snapshot and something like that.
> for example, IO control over the mirror targets or IO control over the
> devices with multipath, ....

I have run dm-ioband on a logical volume disk and it worked well.
http://people.valinux.co.jp/~ryov/dm-ioband/benchmark/lvm.html

> 
> Oh,
> Ryo tsuruta, sorry for many questions.
> 
> Thank you
> -- 
> Best Regards,
> Dong-Jae Kang

Thanks,
Ryo Tsuruta
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