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Virtual Iron Virtualization


Basically I need to virtualize a single new dell server. One virtual server needs to run windows 2003 server standard and Microsoft SQL 2005. The other virtual server will run CentOS Linux with a perl and PostgreSQL application.

The dell server is going to have two quad core xeon processors (8 cores total), 8gigs of ram, and two 15,000rpm SAS drives.

I came across Virutal Iron which is free for the single server instance and seems like it will do the job well. Has anybody used it? What is performance like? Seems to run a Java backend so wondering about the performance there.

Any other recommendations? I looked at VMware but the cost is so high, and probably more then I need, since I only need to virtualize a single server.


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XEN, MS Virtual Server and VMWare all use paravirtualization, while OpenVZ and Virtuozzo use Virtual Containers.

The study reports that response times can increase by 400 to 600% for XEN, even with the host running only a few nodes. This is largely because of the overhead XEN presents.

OpenVZ had a minimal response time increase of around 100% for the same workload. The study also noted that XEN used twice the amount of CPU for the same workload compared to OpenVZ

What the article says is that L2 cache misses (both memory and instruction) signficantly increased in the XEN study. For non Computer Science people, that basically means the processor caching system was far less effective for XEN, compared to OpenVZ (and single OS systems). Caching is important because the time it takes to read instructions or data from RAM is significantly slower than reading instructions from the cache. Cache misses are similar to page-faults (in OS memory architecture).

To a consumer what this means is that Virtual Containers (OpenVZ, Virtuozzo) may offer much better performance than any paravirtualization based solution as long as the host isn't overloading their VPS system.

While paravirtualization offers higher fault-tolerance, in most well designed virtual container based VPS systems, this is minimized and the performance overhead may not be worth it.

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Apache Virtual Host
For some reason, the first virtual host i have listed in apache2.conf gets all the traffic of all the other virtual hosts listed below it.

Example: Domain xyz.com is listed as the first virtual host. the second, third, and fourth are 123.com, 987.com, and mno.com, respectively (fictitious domains). However, it seems that everything below xyz.com goes straight to xyz.com.

If i switch the first entry, xyz.com with any of the others, such as mno.com, so that mno.com is the first virtual host entry, everything then forwards to that domain.

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Can Virtual Account Have Email
I have many sites that use a custom vhosts.conf file to set alternate DocumentRoot to a directory. The Directory holds a script that reads the server_host variable and serves content from a common database but tailored to the referring "site". These phantom sites have only dns zone - set up though WHM, a custom VirtualHost entry for port 80 (web) and a custom VirtualHost entry for port 443 (SSL) (placed in a custom conf file). They are not actual accounts in the sense that they are not set up as new accounts in WHM.

Im wondering if there is a way to set up email accounts for these phantom accounts?

Below are my specs:

WHM 11.2.0 cPanel 11.11.0-S16715
CENTOS Enterprise 4.6 i686 - WHM X v3.1.0

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