Xen & OpenVZ :: Hardware Based Virtualization?
i know xen is hardware based virtualization but is OpenVZ as well is the question
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I'm running a dedicated server and the main site on the server relies on Windows OS. The site is not fully utilizing the potential of the dedicated server, so I'd like to put some of my other sites on the same server and eliminate the other (shared) hosting I've been using. Here's the catch... For the other sites, I'd like to run WHM/Cpanel which requires Linux. If I understand correctly, this leaves me with having to decide on a virtualization solution, which I know nothing about. Some options I have been given are VMware, Virtuozzo, and Xen. Would you suggest one of these or a different solution entirely?
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I have recently created a bunch of OS templates for HyperVM as their current set were hugely outdated / unsuitable. The images tagged modernadmin all include preconfigured DenyHosts to prevent SSH brute forcing of your customers VPS. Available are the following for OpenVZ: centos-5.2-i386-hostinabox-modernadmin.tar.gz530,147.2KB centos-5.2-i386-modernadmin.tar.gz109,654.2KB centos-5.2-x86_64-modernadmin.tar.gz134,665.8KB debian-4.0-i386-modernadmin.tar.gz61,153.3KB debian-4.0-x86_64-modernadmin.tar.gz143,096.5KB debian-5.0-i386-modernadmin.tar.gz75,740.6KB debian-5.0-x86_64-modernadmin.tar.gz159,226.4KB fedora-core-10-i386-modernadmin.tar.gz165,429.6KB fedora-core-10-x86_64-modernadmin.tar.gz174,693.8KB ubuntu-7.10-i386-modernadmin.tar.gz76,415.5KB ubuntu-7.10-x86_64-modernadmin.tar.gz76,133.2KB ubuntu-8.04-i386-modernadmin.tar.gz70,725.7KB ...
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So when buying nehalem servers, if you populate 6 rdimms, you can run at 1333Mhz, if you populate 18 rdimms, 800 Mhz (12 rdimms, 1066mhz) So what do you do for virtualization? the reality is most of the time 48gb is going to be enough for virtualization (that would run 12 4GB servers or 32 2GB servers) and i think at 64gb or more, CPU starts to become a limting factor, but the price of 48GB @ 1333 is slightly more than 72GB @ 800. So what are you guys doing out there? do you go for the performance or do you go with the overkill of memory (that might sometimes come in handy but you probably wont use it all -- more likely just give your VMs more memory for the fun it)? The problem is the 1333 Mhz vs 800 Mhz performance. Our current environment is a bunch of 16GB servers (50xx chip) and the limitation on us virtualizating more per host is the memory. So I know 48GB is going to be very much welcomed and I think we could use more.. 64gb would be ideal, but we will be happy with 48@1333, but 72GB sounds interesting too, there might be some scenarios where we could use that 72GB although i think performance will shift from memory limitation now to CPU Do you think if we buy 800Mhz 72gb we will ever look back and think "wish we bought the 48gb 1333 rdimms and not these 800mhz ones"?
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