There have been a few articles about creating virtual clusters using Xen, for example http://www.clustermonkey.net//content/view/161/33/. It's pretty easy to create a virtual cluster with VMware, too. You can find pre-made virtual machines for a 2 node ParallelKnoppix cluster at http://www.parallelknoppix.net/pmwik...=Main.HomePage
1U BareMetal pfsense opnsense Router Firewall DNS Server 6x 10GB Ethernet Ports
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1U Supermicro Server 10 Bay 2x Intel Xeon 3.3Ghz 8C 128GB RAM 240GB SSD 2x 10GBE
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Supermicro 1U Server X9SRI-F Xeon E5-2640 v2 2.5Ghz 16-Cores / 64GB / No HDD
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HP Proliant MicroServer (Model: HSTNS-5151) NO HARD DRIVES-Power Tested,
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SuperMicro Server 505-2 Intel Atom 2.4GHz 8GB RAM SYS-5018A-FTN4 1U Rackmount
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HP ProLiant MicroServer Gen10 Plus - 16GB RAM No HDD
$500.00
SuperMicro SuperServer 5018A-FTN4 505-2 Intel Atom @ 2.4GHz 8GB w/ Ears
$174.99
HPE ProLiant v2 Ultra Micro Tower Server Pentium Gold G6405 16GB RAM P69102005
$696.73
1U 20" Short Depth Server Firewall PFSense X11SSH-F Xeon 3.5Ghz 32GB RAM NVME
$247.00