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KVM discussion
So I'm wondering, why do people prefer KVM over other visualization types? It's slower compared to openVZ. Sure everything is virtualized, but why is this necessary? Are you doing some heavy modification of an OS (Custom kernel etc etc)?
I guess what I'm asking is, what are the benefits that you get on KVM that you actually use, that's not available in openVZ?
(P.S. - I'm looking for a KVM to play with, preferably in Texas with about 256 MB of ram / 10 GB HD / 100 GB bandwidth for no more than $15 / year. Feel free to shoot me a PM or post in the thread if you have any suggestions)
Comments
I think windows server user need it, because with openvz it's not possible to virtualize windows
I am a N00b though, KVM= Dedicated Resources (Not fully correct), More secure, Separate Kernal, can run almost all OS types and not limited to linux only..
Easy VNC
And hope fully many more....
ba dum tssssss
$15 in this case maybe slightly less, but certainly not impossible... Best of luck...
P.S. I am not a provider
$15 won't happen, it'll be in the $25 - 30 range.
See also, Hostigation and BuyVM.
I know blueVM offered one for $12 for a limited time
Torqhost has one for $13 ish
Both aren't in Texas.
Liquidhost has one but I don't want to spend $20 on something I might use a few times a month.
wasn't joking. sure it's a known reason but you didn't mention it.
Definitely. It's way cheaper to go with KVM than to purchase a windows VPS.
I used to not prefer it. Taste changes over time it seems. I now prefer KVM for the kernel access. It isn't so much about heavy modification as it is simply the freedom to spin up a kernel module as I please.
torqhost.com? Its not in USA but only 15Euros per Year.
A question to ask. Why doesn't any Linode level provider use OVZ? They might know better than us..
@serverian I'm fairly certain that plenty of large hosts use Virtuozzo. Though I'm not particularly certain that the licensing fee, Windows capability, and support make it less likely to be oversold or even more stable. The simplicity of SolusVM and the "free" state of OpenVZ are the only things that can be blamed for the stereotypes that are associated with OpenVZ on these little forums.
I think that stereotypes are more general than the limits of these little forums. I believe around 80% of people who are into VPSes think KVM/Xen HVM/VMWare VPSes are more stable.
You are right. The simplicity of SolusVM and having OVZ free makes every men and their dog go into this business without knowing how to manage servers and without having sustainable market plans other than overselling. They are pushed into overselling to compete with the hosts who are overselling but doing it right. And shit hits the fan. The customers read that another host is being deadpoolled or getting lots of complaints about slow performance. So they look into what virtualization the host uses. They see OVZ. So they blame it.
OVZ, when done right, is beautiful.
Any virtualization, when done poorly, is a trainwreck.
I am not so sure about that. It's not so hard to request tun/tap activation with hosts who don't support this with SolusVM however it can be really pita and time demanding when you need to go back and forth with host to load lets say modules for iptables.
Add in KVM supports ipsec.
For a few of the reasons Serverian has mentioned but also because most of the inexperienced providers around here and on WHT are basically too stupid to be able to setup a KVM node successfully, so they hide behind OVZ.
It's a lot easier to spot a good KVM provider than it is an OVZ one.
KVM like dedi server for me.
OVZ - wrong memory calculation.
Xen - changed kernel.
Why i choese KVM?
But if you want serious argument here is it:
KVM is better than OpenVZ.
Xen HVM can do alot of the same things KVM can do.
It is possible: http://freevps.us/thread-2789.html
@tux it has to be xen or kvm.
Maybe one of the hosts can answer this, why do the LEB kvm offering have relatively low diskspace compaired to openvz. Of course with openvz has overselling, but is the cost of diskspace so much that most providers can only give ~10gb @LEB pricing.
I like KVM because it allows me to do crazy things with own kernels, load FreeBSD, use GlusterFS, Corosync/Pacemaker, experiment with BTRFS, lets me run Mikrotik and IOU, and all of those things OpenVZ doesn't do. But, whenever I need to run a website or web app which doesn't require HA, then OpenVZ is just file.
Because once disk space is allocated you can't have it back. In OpenVZ you share it in a pool.
Say you have 4x1TB in RAID10 = ~1.8TB, try calculate how much disk will be available per VPS that way.
Actually you can probably create sparse volumes for the KVM machines, which would allow you to "overallocate" the disk space there too.
The problem is that with OpenVZ you can do optimizations of the filesystem to cause less seeking of the disks, which results in better performance for everyone.
With KVM everyone has his own file system, usually without optimizations. So there is much higher need for random iops for KVM. If the KVM users were given the same space as the OpenVZ users and they actually use it - this would result in much more seeking / higher load on the disk arrays.
Because many LEB providers don't know how to oversell KVM disk space. It's not enabled by default on SolusVM.
If your talking about enabling Qcow, then maybe it's best they don't
Best way to oversell disk on KVM is with shared storage
Well, quite frankly, so long as the overselling is managed (I know, novel idea), I don't see a problem with them. My favorite method involves not Qcow (eew... fucking eew) but thin provisioned LVM. I'm using such a deal with my upcoming LXC panel (I'm doing a separate deal to @BlueVM 's BlueCP).
KVM is good for windows vps
@ComfortVPS, keep going. Almost 10 posts. You are there!