The iSCSI target server and the
iSCSI initiator are described below.
iSCSI Target Server
The iSCSI target server role
service provides for software-based and hardware-independent iSCSI disk
subsystems. You can use the iSCSI target server to create iSCSI targets and
iSCSI virtual disks. You can then use Server Manager to manage these iSCSI targets
and virtual disks.
The iSCSI target server that is
included in Windows Server 2012 provides the following functionality:
• Network/diskless boot. By
using boot-capable network adapters or a software loader, you can use iSCSI
targets to deploy diskless servers quickly. By using differencing virtual
disks, you can save up to 90 percent of the storage space for the operating
system images. This is ideal for large deployments of identical operating
system images, such as a Hyper-V server farm, or for high-performance computing
(HPC) clusters
Server
application storage. Some applications such as Hyper-V and Microsoft® Exchange Server
require block storage. The iSCSI target server can provide these applications
with continuously available block storage. Because the storage is remotely
accessible, it can also combine block storage for central or branch office
locations.
•
Heterogeneous storage. iSCSI target server supports iSCSI initiators
that are not based on the Windows operating system, so you can share storage on
Windows servers in mixed environments.
• Lab environments. The
iSCSI target server role enables your Windows Server 2012 computers to be
network-accessible block storage devices. This is useful in situations in which
you want to test applications before deploying them on SAN storage.
iSCSI target servers that
provide block storage utilize your existing Ethernet network; no additional
hardware is required. If high availability is an important criterion, consider
setting up a high availability cluster. With a high availability cluster, you
will need shared storage for the cluster—either hardware Fibre Channel storage,
or a Serial Attached SCSI storage array. The iSCSI target server integrates
directly into the failover cluster feature as a cluster role.
iSCSI Initiator
The iSCSI initiator service has
been a standard component installed by default since Windows Server 2008 and
Windows Vista®. To connect your computer to an iSCSI target, you
simply start the Microsoft iSCSI Initiator service, and then configure it.
The features in Windows Server
2012 include:
•
Authentication. You can enable Challenge Handshake Authentication
Protocol (CHAP) to authenticate initiator connections, or you can enable
reverse CHAP to allow the initiator to authenticate the iSCSI target.
• Query initiator computer for
ID. This is only supported with Windows 8.1 or Windows Server 2012
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