Virtualization technology foundation, server virtualization
Common virtualization technologies : vmware, xen, kvm.
Virtualization technology features : partition, isolation, packaging, independent of hardware.
Full virtualization : The abstract VM has the characteristics of a complete physical machine, and the operating system runs on it without any modification.
Paravirtualization : Virtualization that requires operating system assistance
Chip-assisted virtualization : Realize efficient full virtualization with the help of processor hardware support.
IO virtualization includes : complete simulation of device interfaces (low efficiency), front-end and back-end simulation (used by XEN), and direct division (reducing overhead, requiring the purchase of additional components)
Storage virtualization
Storage characteristics
Generalized storage: It has the function of accessing data and has manageability.
Chivalrous storage: data channel and management channel two access channels entities.
Network virtualization technology
(1) Network equipment virtualization:
Network card virtualization: software network card virtualization, hardware network card virtualization
Virtualization of traditional network equipment: virtual routing, link virtualization (link aggregation, tunneling protocol), virtual private network (vpn)
(2) SDN-based network virtualization,
openflow, SDDC software-defined data center
