Xen and KVM - Who is using what and why?
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https://community.spiceworks.com/topic/376890-xen-and-kvm-who-is-using-what-and-why
Found this thread by SAM
Last post by @scottalanmiller was on Aug. 2015.What has changed?
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We've primarily moved to KVM because we are running Scale HC3 which has it built in under the hood.
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@scottalanmiller said in Xen and KVM - Who is using what and why?:
We've primarily moved to KVM before we are running Scale HC3 which has it built in under the hood.
So you like KVM these days better than XS?
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@Dashrender said in Xen and KVM - Who is using what and why?:
@scottalanmiller said in Xen and KVM - Who is using what and why?:
We've primarily moved to KVM before we are running Scale HC3 which has it built in under the hood.
So you like KVM these days better than XS?
Odd conclusion to draw from that statement.
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@scottalanmiller said in Xen and KVM - Who is using what and why?:
@Dashrender said in Xen and KVM - Who is using what and why?:
@scottalanmiller said in Xen and KVM - Who is using what and why?:
We've primarily moved to KVM before we are running Scale HC3 which has it built in under the hood.
So you like KVM these days better than XS?
Odd conclusion to draw from that statement.
Not entirely. You moved to KVM before getting the Scale. If not because you like it better, then why?
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@Dashrender said in Xen and KVM - Who is using what and why?:
@scottalanmiller said in Xen and KVM - Who is using what and why?:
@Dashrender said in Xen and KVM - Who is using what and why?:
@scottalanmiller said in Xen and KVM - Who is using what and why?:
We've primarily moved to KVM before we are running Scale HC3 which has it built in under the hood.
So you like KVM these days better than XS?
Odd conclusion to draw from that statement.
Not entirely. You moved to KVM before getting the Scale. If not because you like it better, then why?
No, we did not. We use KVM exclusively with Scale as an artefact of the Scale system. My wording must be odd above,
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You did not really "move" to KVM because Scale "hides" all the KVM?
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@FATeknollogee said in Xen and KVM - Who is using what and why?:
You did not really "move" to KVM because Scale "hides" all the KVM?
You could say that about any system. But we "use" KVM instead of something else (like Xen or VMware). But you'd never say that we didn't move "from" Xen because it was hidden behind XenServer or that VMware ESXi is hidden behind vCenter. The hypervisor we are on is KVM and we definitely moved to it. That we use Scale as the interface to it, or virsh or whatever does matter in the big picture, but regardless of those tools, it's still KVM that we are running on.
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You certainly did not install KVM like you would have had to with XS?
Does Scale let you tinker/tweak "under the hood"?
btw, why/how is this different from FreeNAS "hiding" the BSD o/s?
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@FATeknollogee said in Xen and KVM - Who is using what and why?:
You certainly did not install KVM like you would have had to with XS?
Does Scale let tinker/tweak "under the hood"?
btw, why/how is this different from FreeNAS "hiding" the BSD o/s?
FreeNAS is to Ubuntu as FreeBSD is to Debian.
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@scottalanmiller said in Xen and KVM - Who is using what and why?:
@FATeknollogee said in Xen and KVM - Who is using what and why?:
You did not really "move" to KVM because Scale "hides" all the KVM?
You could say that about any system. But we "use" KVM instead of something else (like Xen or VMware). But you'd never say that we didn't move "from" Xen because it was hidden behind XenServer or that VMware ESXi is hidden behind vCenter. The hypervisor we are on is KVM and we definitely moved to it. That we use Scale as the interface to it, or virsh or whatever does matter in the big picture, but regardless of those tools, it's still KVM that we are running on.
Not sure I agree with that. It would depend on why you moved to Scale. If it was because of KVM, then I'll give you your point - the fact that it was part of the deal doesn't mean the same when you say " We moved from Xen to KVM" you didn't, you moved from Xen (or XenServer) to Scale, the fact that it was KVM, unless it was the driving factor, has little to do with it.
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@FATeknollogee said in Xen and KVM - Who is using what and why?:
You certainly did not install KVM like you would have had to with XS?
What do you mean? In both cases a higher package installs it for you along with the management layer. I would say that they are identical in that way. If you are thinking of Scale nodes that come pre-loaded, which normally they do, then it is no different than getting XS pre-loaded on hardware.
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@FATeknollogee said in Xen and KVM - Who is using what and why?:
You certainly did not install KVM like you would have had to with XS?
Does Scale let you tinker/tweak "under the hood"?
Does XS? In both cases... no, unless you are willing to give up support, then yes.
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@FATeknollogee said in Xen and KVM - Who is using what and why?:
btw, why/how is this different from FreeNAS "hiding" the BSD o/s?
Supported appliance. FreeNAS would be the alternative. The comparison with Scale would be to an EMC VMAX. Remember, it's specifically that FreeNAS ads nothing, only takes away. Very different here.
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@DustinB3403 said in Xen and KVM - Who is using what and why?:
@FATeknollogee said in Xen and KVM - Who is using what and why?:
You certainly did not install KVM like you would have had to with XS?
Does Scale let tinker/tweak "under the hood"?
btw, why/how is this different from FreeNAS "hiding" the BSD o/s?
FreeNAS is to Ubuntu as FreeBSD is to Debian.
No, Ubuntu adds the support and tons of important testing, versioning and features. FreeNAS does none of that.
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@Dashrender said in Xen and KVM - Who is using what and why?:
@scottalanmiller said in Xen and KVM - Who is using what and why?:
@FATeknollogee said in Xen and KVM - Who is using what and why?:
You did not really "move" to KVM because Scale "hides" all the KVM?
You could say that about any system. But we "use" KVM instead of something else (like Xen or VMware). But you'd never say that we didn't move "from" Xen because it was hidden behind XenServer or that VMware ESXi is hidden behind vCenter. The hypervisor we are on is KVM and we definitely moved to it. That we use Scale as the interface to it, or virsh or whatever does matter in the big picture, but regardless of those tools, it's still KVM that we are running on.
Not sure I agree with that. It would depend on why you moved to Scale. If it was because of KVM, then I'll give you your point - the fact that it was part of the deal doesn't mean the same when you say " We moved from Xen to KVM" you didn't, you moved from Xen (or XenServer) to Scale, the fact that it was KVM, unless it was the driving factor, has little to do with it.
I don't agree at all. We were on Xen and ESXi, we moved, to what, KVM. You cannot say we didn't move from one to the other. Who packages or the reason that you move are not factors in "if you moved" and to "what".
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@scottalanmiller said in Xen and KVM - Who is using what and why?:
@FATeknollogee said in Xen and KVM - Who is using what and why?:
You certainly did not install KVM like you would have had to with XS?
Does Scale let you tinker/tweak "under the hood"?
Does XS? In both cases... no, unless you are willing to give up support, then yes.
With XS, you can download the software & install on HW of your choice & still buy support if you'd like.
Can you do that with Scale?
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@FATeknollogee said in Xen and KVM - Who is using what and why?:
@scottalanmiller said in Xen and KVM - Who is using what and why?:
@FATeknollogee said in Xen and KVM - Who is using what and why?:
You certainly did not install KVM like you would have had to with XS?
Does Scale let you tinker/tweak "under the hood"?
Does XS? In both cases... no, unless you are willing to give up support, then yes.
With XS, you can download the software & install on HW of your choice & still buy support if you'd like.
Can you do that with Scale?
So you are saying that the licensing of the management layer determines if you are using a hypervisor? I don't see how this question is related to the topic.
If you use Xen but manage it from a hosted SaaS, does it mean that you didn't move to Xen because you used a tool somewhere else that isn't Xen but since it manages Xen that's what you are going to focus on?
You are missing the simple point that we moved from Xen to KVM. No grey area, no sort ofs. It's as plain as can be. We also moved from XS as the management layer to Scale, but that's "also" and does not have anything effect on the answer "did we move to KVM."
Let's ask it in another way... if you think we didn't move to KVM, are you saying we are still on Xen and didn't move? What are you trying to say?
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Let's try this with another example where you don't control the hardware....
If you move from Rackspace to Office 365 email, you have moved to Exchange. You don't control the hardware, you can't install Office 365 on anything you want, it is a service. But you are still getting your email through Exchange and Exchange is your MTA. You've moved to Exchange. That it is hosted isn't a factor in that.
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@scottalanmiller said in Xen and KVM - Who is using what and why?:
Let's try this with another example where you don't control the hardware....
If you move from Rackspace to Office 365 email, you have moved to Exchange. You don't control the hardware, you can't install Office 365 on anything you want, it is a service. But you are still getting your email through Exchange and Exchange is your MTA. You've moved to Exchange. That it is hosted isn't a factor in that.
Right, but unless you moved specifically for the purpose of getting Exchange, which is where I was going in my post, then you shouldn't tell people you moved from Rackspace to Exchange - you should tell people you moved from Rackspace to O365 (sadly many people don't know O365 is Exchange).
The under lying technology isn't what's important unless that was the driving decision in going to that platform from a general discussion standpoint.
