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From Eric Lee Green <>
Subject Re: hypervisor choice
Date Fri, 10 Nov 2017 19:37:41 GMT
On 11/10/2017 11:01 AM, Ron Wheeler wrote:
> I have been using CentOS for a long time but they seem to have screwed 
> up the recent updates to CentOS 7 to the point where after updating to 
> the latest version (originally build 514 and now 683), the system no 
> longer boots. I have to boot to build 327 which runs fine.
> The idea of having a server that fails after updating is not in my 
> comfort zone. 
The other popular choice if you are using KVM on Linux is Ubuntu LTS. 
The current LTS version is 16.04 which is supported until 2021. 
Cloudstack runs fine on Ubuntu LTS, but configuring the network may be a 
bit cumbersome for someone accustomed to the Centos 
/etc/sysconfig/network-scripts mechanism.

In my experience over the years Ubuntu has not been quite as stable as 
Red Hat Enterprise Linux, *but*, that may have changed with RHEL7/Centos 
7, where they appear to break things regularly between minor version 
updates in order to "improve" the system. I, too, ended up with the 
issue of one of my Centos 7 servers not rebooting after an update, and 
having to boot it back to an older kernel. I ended up re-formatting and 
re-installing that server entirely and restoring the system 
configuration from backups.

At this point I'd suggest remaining with KVM on Linux as your 
hypervisor. It appears to perform better overall than Xen or vSphere and 
the cost-effectiveness overall cannot be beat, especially if you are 
buying hardware in bulk and using an automated mechanism to deploy your 
hardware and the software load upon it so that you don't have to manage 
it individually.

If you are looking for overall reliability (at a cost), vSphere is of 
course "the" reliable choice (I have some ESXi hosts that have been up 
for over 500 days, and the last time they went down was during a planned 
outage to rearrange the racks), but it is very picky about its hardware 
and likely won't like your current hardware. It can also become somewhat 
expensive as you add hosts to your vSphere cluster, which is the basis 
of a CloudStack pod (rather than the individual hosts). It's also as 
much as 10% slower by my measurements under many workloads because they 
make numerous decisions that improve reliability at the expense of 
performance. Still, for customers that value reliability above all else, 
vSphere is a brick -- reliable and pretty much bullet-proof.

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