IBM DS3950, Installation, User'S, And Maintenance Manual, Page: 31 / 252

http://www.ibm.com/systems/support/storage/config/ssic/index.jsp
See “Finding DS3950, DS4000, and DS5000-family readme files” on page xxiii to
learn how to access the DS3950, DS4000, and DS5000-family readme files on the
Web.
FC-SAS defined
In this document, the term FC-SAS refers to a SAS drive with a FC-SAS interposer
that translates the SAS drive interface to a FC protocol interface. Contrast with “SAS
defined”.
Fibre Channel defined
Fibre Channel technology is outlined in the SCSI-3 Fibre Channel Protocol
(SCSI-FCP) standard. Fibre Channel is a high-speed data transport technology that
is used for mass storage and networking.
Using a Fibre Channel arbitrated loop (FC-AL), more than 100 Fibre Channel
devices can be supported, compared to 15 small computer system interface (SCSI)
devices. The Fibre Channel connection speed from the storage subsystem to storage
expansion enclosures is 4 Gbps, and enables data transfer rates up to 400 Mbps
half-duplex and 800 Mbps full-duplex on optical interfaces.
iSCSI defined
The Internet Small Computer System Interface (iSCSI) is an IP-based standard for
linking data storage devices over a network and transferring data by carrying SCSI
commands over IP networks.
SAS defined
The Serial-attached SCSI (SAS) is a data-transfer technology that moves data to and
from computer storage devices such as hard drives and tape drives. SAS uses a
point-to-point serial protocol instead of the traditional parallel SCSI bus
technology. In this document, the term
FC-SAS refers to a SAS drive with a
FC-SAS interposer that translates the SAS drive interface to a FC protocol interface.
See “FC-SAS defined”.
SATA defined
The Serial Advanced Technology Attachment (SATA) interface offers increased data
rate performance over Parallel Advanced Technology Attachment (ATA), while
maintaining the benefits of ATA. SATA is designed to overcome the performance
barriers that have been forecasted for current parallel technologies while
maintaining the cost-efficiency of Parallel ATA. SATA specifications allow for
thinner, more flexible cables, and lower pin counts. It also enables easier, more
flexible cable routing management and the use of smaller connectors than is
possible with the existing Parallel ATA technology.
The Serial ATA Working Group introduced the first SATA specification, Serial ATA
1.0, in 2001 (http://www.serialata.org).
T10 PI defined
The T10 Protection Information (T10 PI) is an extension of the SCSI protocol that
protects user data during transfer between a sender and a receiver. Hard disk
drives with T10 PI support are formatted with 520-byte sectors instead of the
typical 512-byte sectors. The extra 8 bytes are used to store data integrity
Chapter 1. Introduction
3