[Engine-devel] Instance Types Feature

[Laszlo Hornyak]

hi,

This is what I thought of:

In public clouds it is common to have pre-defined instance types e.g. amazon small/medium/large/x-large instance, and this is what customers get even if they don't like it. I guess this helps Amazon a lot to simplify the decision logic for vm scheduling and pricing.

In a private cloud, you choose the resources your application needs, therefore you can choose just as much as you need.

Of course after introducing the instance type in ovirt, you will still have control over the instance types and create any instance type you like beyond the pre-defined types you have in public cloud, but you will have two things to set: the instance type and the image, which is more administration than just working with templates, while most of the cases the templates were enough: you created both the OS image and the virtual hardware profile it is running on. For another image and another workload, I would most likely want to create another one that just fits the needs.

This is why I think keeping the template as an entity composed out of an image and a instance type would be great.

Laszlo

----- Original Message -----
> From: "Tomas Jelinek" <tjelinek at redhat.com>
> To: "Laszlo Hornyak" <lhornyak at redhat.com>
> Cc: engine-devel at ovirt.org
> Sent: Friday, January 25, 2013 1:32:20 PM
> Subject: Re: [Engine-devel]  Instance Types Feature
> 
> Hi Laszlo,
> 
> it is not useful just for public clouds - it can be pretty useful for
> private as well. But to keep the previous way, it could be done this
> way:
> - on the advanced screen (after clicking "show advanced options" you
> can specify the template)
> - by default you pick on basic view the instance type (e.g. HW
> profile) and the Image (e.g. disk with some metadata such as OS
> type). But, you can select custom instance type (equivalent to
>  blank template) and no Image. In this case the template appears
> also on basic view and you can select it.
> 
> What do you think?
> 
> Tomas
> 
> ----- Original Message -----
> From: "Laszlo Hornyak" <lhornyak at redhat.com>
> To: "Tomas Jelinek" <tjelinek at redhat.com>
> Cc: engine-devel at ovirt.org
> Sent: Tuesday, January 22, 2013 7:16:32 PM
> Subject: Re: [Engine-devel]  Instance Types Feature
> 
> Hi Tomas,
> 
> I like the idea in general, but for me the instance types looks like
> a feature that is typical in public clouds, while in private clouds
> it looks more like a cool extra feature for special cases. Therefore
> in my opinion it would be great to keep the old template solution as
> well to keep it simple for most users. A template could be an
> instance type and an image together. Only the description overlap,
> and that could be solved.
> 
> Thanks,
> Laszlo
> 
> ----- Original Message -----
> > From: "Tomas Jelinek" <tjelinek at redhat.com>
> > To: engine-devel at ovirt.org
> > Sent: Tuesday, January 22, 2013 3:09:51 PM
> > Subject: [Engine-devel]  Instance Types Feature
> > 
> > Hi All,
> > 
> > this is the proposed new feature called instance types:
> > http://www.ovirt.org/Features/Instance_Types
> > 
> > Long story short - it should basically split the VM template into:
> > - "hardware profile" called instance types
> > - "software profile" called image
> > 
> > This should enable to do something like: Create a new "small" VM
> > and
> > attach a disk with "RHEL + Postgres" installed.
> > 
> > Any comments are more than welcome!
> > 
> > Tomas
> > _______________________________________________
> > Engine-devel mailing list
> > Engine-devel at ovirt.org
> > http://lists.ovirt.org/mailman/listinfo/engine-devel
> > 
>