HP ProLiant ML350 G5 Storage Server Administration Guide (5697-5854, September 2006)

Primary storage
Secondary storage
Tertiary storage
Fibre Channel and SCSI disk storage
Serial ATA disk storage
Tape
Storage
Optical
archive
gl0057
Figure 1 Tiered storage
iSCSI tec
hnology
The iSCSI
protocol defines the rules and processes for transporting SCSI (block-level) data over a TCP/IP
network.
The iSCSI standard follows the SCSI architectural model, which is based on message ex change
between
an initiator and a target. In the SCSI model, initiators and targets are identified by a unique
SCSI dev
ice nam e. Because iSCSI transport occurs over a network fabric instead of a direct cable
connection, the initiator a n d target have multiple IP addresses associated with their iSCSI names.
The following is an example of what occurs during a message exchange bet ween an initiator and
a target. The process begins when an application sends a request to the operating system (OS) to
read or write data. The OS generates the appropriate SCSI commands and data request in the form
of a message. Before the message can be sent over an IP network, it is processed through iSCSI to
encapsulate the request into the TCP/IP protocol stack (attaching routing, error checking, and control
information) for transmission over the network. This can be accomplished using driver- or OS-level
software, or it can be offloaded to the host bus adapter (HBA). The HBA transmits the packets over the IP
netw
ork. When the packets reach the target device, they go through a reverse process to reassemble
(seq
uence) the data, which is then moved to the SCSI controller. The SCSI controller fulfills the request by
writing data to, or reading data from, the target device. If it is a read transaction, the target returns data
to the initiator using the iSCSI p rotocol.
For further information about HP StorageWorks iSCSI products, visit h
ttp://www.hp.com/go/nas.
Windows Storage Server 2003 R2 editions
Windows Storage Server 2003 R2 is a dedicated file and print server application based on Windows
Server 2003, with dependability and seamless integration in networked storage. Windows Storage
Server 2003 R2 integrates with existing infrastructures and s upports heterogeneous file serving as
well as backup and replication of stored data. Windows Storage Server is also an ideal solution for
consolidating multiple file ser vers into a single solution that enables cost reduction and policy-based
management of storage resources. Windows Storage Server 2003 R2 includes advanced availability
features such as point-in-time data copies, replication, and server clustering. Because Windows Storage
Server 2003 R2 solutions are preconfigured, they can be deployed out of the box in a short time, and the
HP Storage Server Management Console m akes management easy. Windows Storage Server 2003
R2 integrates with existing infrastructures, so enterprises can make full use of commonly-used network
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