2.4 Explain the purposes of virtualization and network storage technologies.

Question 1

Network virtualization

Answer 1

• Server farm with 100 individual computers
• All servers are connected with enterprise switches and routers, with redundancy

• Migrate 100 physical servers

Question 2

The hypervisor

Answer 2

• Virtual Machine Manager
• Manages the virtual platform and guest OS
• May require a CPU that supports virtualization
• Hardware management
• CPU, networking, security

Question 3

Network requirements

Answer 3

• Most client-side virtual machine managers have their own virtual (internal) networks

Question 4

• Shared network address

Answer 4

• The virtual machine shares the same IP address as the physical host
• Uses a private IP address internally
• Uses NAT to convert to the physical host IP

Question 5

• Bridged network address

Answer 5

• The VM is a device on the physical network

Question 6

• Private address

Answer 6

• The VM does not communicate outside of the virtual network

Question 7

• Network Attached Storage (NAS)

Answer 7

• Connect to a shared storage device across the network

* File-level access

Question 8

• Storage Area Network (SAN)

Answer 8

• Looks and feels like a local storage device
• Block-level access
• Requires a lot of bandwidth

Question 9

Jumbo frames

Answer 9

• Ethernet frames with more 
than 1,500 bytes of payload
• Increases transfer efficiency
• Ethernet devices must support jumbo frames
• Switches, interface cards

Question 10

Fibre Channel (FC)

Answer 10

• A specialized high-speed topology

* Servers and storage connect to a Fibre Channel switch -SCSI, SAS, or SATA commands

Question 11

Fibre Channel over the data network

Answer 11

• Fibre Channel over Ethernet (FCoE)
• Usually integrates with an existing Fibre Channel
• Not routable

Question 12

iSCSI

Answer 12

• Internet Small Computer Systems Interface - Send SCSI commands over an IP network
• Can be managed quite well in software

• Makes a remote disk look and operate like a local disk

Question 13

InfiniBand

Answer 13

• High-speed switching topology
• Copper and Fiber options
• QSFP connectors
• Popular use in research and supercomputers