Chapter 9 Introduction to the Server
391
fabric switch
a switch designed
especially for Fibre
Channel networking
and that provides a
direct or switched
connection between
two points.
Internet Small
Computer Systems
Interface (iSCSI)
an IP-based storage
technology that
uses IPv4 and IPv6
network addresses
to identify storage
devices on a LAN,
MAN, or WAN.
Fibre Channel Fabric Switched Topology
The fabric switched topology uses a device known as a fabric switch. A fabric
switch is a switch designed especially for Fibre Channel networking. The fabric
switch provides a direct or switched connection between two points. When two
points wish to communicate, a private link, or channel, is set up between the two
devices. This method is best used when numerous nodes wish to access the same
disk storage array. For example, a university consisting of many buildings can
connect each building’s server to a common disk storage array using the fabric
switched topology. This way, departments in each building can have access to
research documents stored in the disk storage array. They can also access servers
in other buildings through a high-speed connection.
Internet Small Computer Systems Interface
Internet Small Computer Systems Interface (iSCSI) is a network storage
standard developed by the Internet Engineering Task Force (IETF). It is used to
access a wide variety of storage devices such as tapes, disks, and storage arrays.
The iSCSI (pronounced eye-scuzzy) standard is referred to as IP-based storage
because it is designed to work on a LAN, MAN, or WAN using IPv4 and IPv6
network addresses to identify the storage device. iSCSI operates by sending SCSI
commands over Ethernet using NFS or SMB/CIFS protocols. The two advantages
of iSCSI are the following:
■ Storage devices can be located at great distances from the client. This
overcomes the limitations of systems such as Fibre Channel.
■ It is less expensive than Fibre Channel SANs.
Windows 7 and Windows Server 2008 have a GUI interface called iSCSI Initiator
for confi guring iSCSI. It can be accessed from the
Administrative Tools
menu,
Figure 9-27.
The iSCSI initiator is the workstation or server making the requests to the
storage device. It is called the target and can be located either on the local area
network or at some distant location across the Internet.
The iSCSI properties can be confi gured automatically through the Network
Discovery feature or manually. Look at Figure 9-28 to see how the Network Discovery
feature can automatically locate an iSCSI device on the local area network. In this
example, the iSCSI storage device is located on a Windows Server 2008 computer
using IP address 192.168.1.103.
iSCSI devices can be located across the Internet by using an iSCSI qualifi ed
name (IQN) or an Enterprise Unique Name (EUI). The name can be automatically
generated based on information provided by the Network Discovery feature.
Figure 9-29 shows an example of an IQN address. The IQN address in the
example is iqn.1991-05.com.microsoft:richar7.netlab1domain.local. The IQN name
format is type–date–authority–string defi ned by naming authority:
where
Type = iqn
Date = month and year domain
was acquired
Authority = domain name
String defi ned by naming authority = String of characters identifying
the iSCSI object
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Extracted Text (may have errors)


Chapter 9 Introduction to the Server
391
fabric switch
a switch designed
especially for Fibre
Channel networking
and that provides a
direct or switched
connection between
two points.
Internet Small
Computer Systems
Interface (iSCSI)
an IP-based storage
technology that
uses IPv4 and IPv6
network addresses
to identify storage
devices on a LAN,
MAN, or WAN.
Fibre Channel Fabric Switched Topology
The fabric switched topology uses a device known as a fabric switch. A fabric
switch is a switch designed especially for Fibre Channel networking. The fabric
switch provides a direct or switched connection between two points. When two
points wish to communicate, a private link, or channel, is set up between the two
devices. This method is best used when numerous nodes wish to access the same
disk storage array. For example, a university consisting of many buildings can
connect each building’s server to a common disk storage array using the fabric
switched topology. This way, departments in each building can have access to
research documents stored in the disk storage array. They can also access servers
in other buildings through a high-speed connection.
Internet Small Computer Systems Interface
Internet Small Computer Systems Interface (iSCSI) is a network storage
standard developed by the Internet Engineering Task Force (IETF). It is used to
access a wide variety of storage devices such as tapes, disks, and storage arrays.
The iSCSI (pronounced eye-scuzzy) standard is referred to as IP-based storage
because it is designed to work on a LAN, MAN, or WAN using IPv4 and IPv6
network addresses to identify the storage device. iSCSI operates by sending SCSI
commands over Ethernet using NFS or SMB/CIFS protocols. The two advantages
of iSCSI are the following:
■ Storage devices can be located at great distances from the client. This
overcomes the limitations of systems such as Fibre Channel.
■ It is less expensive than Fibre Channel SANs.
Windows 7 and Windows Server 2008 have a GUI interface called iSCSI Initiator
for confi guring iSCSI. It can be accessed from the
Administrative Tools
menu,
Figure 9-27.
The iSCSI initiator is the workstation or server making the requests to the
storage device. It is called the target and can be located either on the local area
network or at some distant location across the Internet.
The iSCSI properties can be confi gured automatically through the Network
Discovery feature or manually. Look at Figure 9-28 to see how the Network Discovery
feature can automatically locate an iSCSI device on the local area network. In this
example, the iSCSI storage device is located on a Windows Server 2008 computer
using IP address 192.168.1.103.
iSCSI devices can be located across the Internet by using an iSCSI qualifi ed
name (IQN) or an Enterprise Unique Name (EUI). The name can be automatically
generated based on information provided by the Network Discovery feature.
Figure 9-29 shows an example of an IQN address. The IQN address in the
example is iqn.1991-05.com.microsoft:richar7.netlab1domain.local. The IQN name
format is type–date–authority–string defi ned by naming authority:
where
Type = iqn
Date = month and year domain
was acquired
Authority = domain name
String defi ned by naming authority = String of characters identifying
the iSCSI object

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