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Can I Use Multiple Virtualization Technologies Simultaneously under Linux?

Q. I was reading this article and wanted to try out KVM, XEN, VMWare and VirtualBox simultaneously on my desktop system with 2GB RAM? Why I'm not able to use run multiple virtualization technologies simultaneously under Ubuntu Linux? Can a powerful Linux server run multiple virtualization technologies simultaneously?
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Solaris UNIX LUN Rescan With cfgadm Command

I know how to do LUN rescan under Linux using echo command. A reboot option (downtime) is not available for me. How do I rescan LUN under Solaris UNIX operating systems?

The cfgadm command provides configuration administration operations on dynamically reconfigurable hardware resources. Pass the -l option to Lists the state and condition of attachment points specified. Login as root and type the following command:
cfgadm -al
For further information read cfgadm and format command man page