HP D2200sb Serial Attached SCSI technology, 3rd edition - Page 2

Introduction, SAS terminology, Table 1 contains terms helpful in understanding SAS technology. - scsi

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Introduction This technology brief describes Serial Attached SCSI-2 (SAS-2) technology, interoperability with Serial Advanced Technology Attachment (SATA) devices, enhancements to SAS-2 cabling and connectors, and SAS topologies and zoning. SAS terminology Table 1 contains terms helpful in understanding SAS technology. Table 1. SAS terminology Term Definition Domain Enterprise-class devices Entry-level devices Expander Initiator A set of SAS devices that communicate with one another through a service delivery subsystem. SAS drives that provide maximum reliability, highest performance, scalability, and error management. Typically used for unconstrained I/O workloads in missioncritical applications. SATA drives that provide a basic level of reliability and performance for nonmission-critical environments. A device that functions as a switch to attach one or more initiators to one or more targets. A device containing SSP, STP, or SMP initiator ports in a SAS domain. Midline devices PHY SAS and SATA drives that provide larger capacity, greater reliability, and improved resistance to rotational and operational vibration than Entry-level devices. The mechanism that connects the physical SAS layer to the SAS link layer. Physical link SAS address Two differential signal pairs, one pair in each direction, that connect two physical PHYs. The address of an initiator port, a target port, or an expander device. Serial ATA Tunneling Protocol (STP) Serial Management Protocol (SMP) Serial SCSI Protocol (SSP) A protocol used to communicate with SATA drives. A protocol used to communicate with SAS expanders. A protocol used to communicate with SAS drives. Service delivery subsystem Target The part of a SAS system that sends information between a SAS initiator and a SAS target. An end device such as a SAS disk drive, SATA disk drive, or SAS tape drive. Training The method of equalizing transmission signals at the receiver. Wide port A port that contains more than one PHY. Zone group A set of PHYs in a zone that all have the same access permission. Zoned portion of a service Part of a service delivery subsystem that includes zoning expander devices delivery subsystem (ZPSDS) cooperating to control access between PHYs 2

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Introduction
This technology brief describes Serial Attached SCSI-2 (SAS-2) technology, interoperability with Serial
Advanced Technology Attachment (SATA) devices, enhancements to SAS-2 cabling and connectors,
and SAS topologies and zoning.
SAS terminology
Table 1 contains terms helpful in understanding SAS technology.
Table 1.
SAS terminology
Term
Definition
Domain
A set of SAS devices that communicate with one another through a service delivery
subsystem.
Enterprise-class devices
SAS drives that provide maximum reliability, highest performance, scalability, and
error management. Typically used for unconstrained I/O workloads in mission-
critical applications.
Entry-level devices
SATA drives that provide a basic level of reliability and performance for non-
mission-critical environments.
Expander
A device that functions as a switch to attach one or more initiators to one or more
targets.
Initiator
A device containing SSP, STP, or SMP initiator ports in a SAS domain.
Midline devices
SAS and SATA drives that provide larger capacity, greater reliability, and improved
resistance to rotational and operational vibration than Entry-level devices.
PHY
The mechanism that connects the physical SAS layer to the SAS link layer.
Physical link
Two differential signal pairs, one pair in each direction, that connect two physical
PHYs.
SAS address
The address of an initiator port, a target port, or an expander device.
Serial ATA Tunneling
Protocol (STP)
A protocol used to communicate with SATA drives.
Serial Management
Protocol (SMP)
A protocol used to communicate with SAS expanders.
Serial SCSI Protocol (SSP)
A protocol used to communicate with SAS drives.
Service delivery subsystem
The part of a SAS system that sends information between a SAS initiator and a SAS
target.
Target
An end device such as a SAS disk drive, SATA disk drive, or SAS tape drive.
Training
The method of equalizing transmission signals at the receiver.
Wide port
A port that contains more than one PHY.
Zone group
A set of PHYs in a zone that all have the same access permission.
Zoned portion of a service
delivery subsystem (ZPSDS)
Part of a service delivery subsystem that includes zoning expander devices
cooperating to control access between PHYs