Wondering KVM

[Vahric Muhtaryan <va...@doruk.net.tr>]

Hello All , 

Sorry for this stupid question but i really wonder why KVM is used or trying
to use as a hypervisor option. (Sorry for out of scope of this list) but try
to learn people understandings, also i do not want to say do not use it :D
Mostly third party supported hypervisor is vmware
XenServer and Hyper-v is i guess mostly third party supported hypervisors
Then i can see the KVM , because of mostly IBM focus on it

My point of view ; 
Using iscsi, FC is a problem because need shared mount point
No internal DRS or WLB or kind of distributing algorithm.
Backup , no any 3th party software i know support KVM
If we start to talk about Disaster Recovery finding solution should be very
hard
If its free Citrix XenServer is free

I¹m confusing when i think all , i don¹t know any performance pluses then
the other hypervisors but i don¹t know how to compare it with all such
parameters 
Of course every people have their own ideas but could you pls share it to
understand better.

Regards
VM

Re: Wondering KVM

[Nux! <nu...@li.nux.ro>]

On 11.11.2013 16:24, Vahric Muhtaryan wrote:
> Hello All ,
> 
> Sorry for this stupid question but i really wonder why KVM is used or 
> trying
> to use as a hypervisor option. (Sorry for out of scope of this list) 
> but try
> to learn people understandings, also i do not want to say do not use 
> it :D
> Mostly third party supported hypervisor is vmware
> XenServer and Hyper-v is i guess mostly third party supported 
> hypervisors
> Then i can see the KVM , because of mostly IBM focus on it
> 
> My point of view ;
> Using iscsi, FC is a problem because need shared mount point
> No internal DRS or WLB or kind of distributing algorithm.
> Backup , no any 3th party software i know support KVM
> If we start to talk about Disaster Recovery finding solution should be 
> very
> hard
> If its free Citrix XenServer is free
> 
> I¹m confusing when i think all , i don¹t know any performance pluses 
> then
> the other hypervisors but i don¹t know how to compare it with all such
> parameters
> Of course every people have their own ideas but could you pls share it 
> to
> understand better.
> 
> Regards
> VM

There are many advantages to using KVM. Think of it like the Linux of 
the virtualisation world. Start learning it, fast. :)

The main reason I like it is that it comes bundled with the linux 
kernel, as such I can just keep running my favourite linux distro that I 
know and trust and which can do more than a minimal management layer.

Need to run a VM on the same box with a CPanel? Done,just yum install 
it. Need to test something in a VM on your PXE deployment box? Done, yum 
install it. On an ARM server? Done. Need to run NFS server, cloudstack 
management server, mysql server and hypervisor on the same box? Done. :)

It's very flexible, "geeky" and it's a bit DIY, most sysadmins I know 
love this part of it and it has turned out a great success.

It's simple, it doesn't try to do too much, it's a hypervisor and 
that's what it does, the rest is done by hand or through libvirt.

It has no Windows management interfaces (so "IT managers" stay away), 
though Cloudstack helps in this case. :)

It's free and open source, which is amazing really.

It comes with a nice VNC replacement (http://www.spice-space.org/) that 
is also free and open source (and supported in other "stacks").

It can talk to a lot of block device stuff (CEPH, GlusterFS, iSCSI, 
Sheepdog etc etc) and I bet it will be the first to support whatever new 
(open source) technology comes along.

It's from RedHat (yeah, I know) which has a really good karma 
considering.

etc etc

-- 
Sent from the Delta quadrant using Borg technology!

Nux!
www.nux.ro

Re: Wondering KVM

[BJO ERN <bj...@gmail.com>]

I can only speak for me why we are moving to KVM.
It starts with license costs which will be an issue once you have several
hundred hosts like I have.
Going on we were a big "Citrix" Xen shop but after issues with Citrix
Xenserver 6 (XCP variant) like openvswitch performance issues, XAPI
communication issues between VMs and hypervisor we decided to switch.
Overall important is stability above features and another big plus for

KVM is you can easily roll out bare metal via Kickstart and Puppet/Chef a
option we only discovered recently for xenserver.

Now is xenserver free but there were still enough issues in the past for us
to even consider it again.



On Mon, Nov 11, 2013 at 8:24 AM, Vahric Muhtaryan <va...@doruk.net.tr>wrote:

> Hello All ,
>
> Sorry for this stupid question but i really wonder why KVM is used or
> trying
> to use as a hypervisor option. (Sorry for out of scope of this list) but
> try
> to learn people understandings, also i do not want to say do not use it :D
> Mostly third party supported hypervisor is vmware
> XenServer and Hyper-v is i guess mostly third party supported hypervisors
> Then i can see the KVM , because of mostly IBM focus on it
>
> My point of view ;
> Using iscsi, FC is a problem because need shared mount point
> No internal DRS or WLB or kind of distributing algorithm.
> Backup , no any 3th party software i know support KVM
> If we start to talk about Disaster Recovery finding solution should be very
> hard
> If its free Citrix XenServer is free
>
> I¹m confusing when i think all , i don¹t know any performance pluses then
> the other hypervisors but i don¹t know how to compare it with all such
> parameters
> Of course every people have their own ideas but could you pls share it to
> understand better.
>
> Regards
> VM
>
>
>
>