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Serial Attached SCSI

In computing, Serial Attached SCSI (SAS) is a point-to-point serial protocol that moves data to and from computer-storage devices such as hard disk drives, solid-state drives and tape drives. SAS replaces the older Parallel SCSI (Parallel Small Computer System Interface, usually pronounced "scuzzy") bus technology that first appeared in the mid-1980s.…

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Characteristics

LayersPHYsPhysical layer8b/10b data encodingSCSI Express
15 related topics

Comparison with SATA

Tagged command queuingNative command queuingATAPICDSATA 2.0
9 related topics

Comparison with parallel SCSI

Point-to-pointMultidropContentionTerminationClock skew
7 related topics

Identification and addressing

World Wide NameEthernetMAC addressFibre Channel
4 related topics

Key facts & relationships

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Hotplugging interface
Yes
No. of devices
65,535
Speed
SAS-1: 3 Gbit/s Full-duplex (2004) · SAS-2: 6 Gbit/s Full-duplex (2010) · SAS-3: 12 Gbit/s Full-duplex (2014) · SAS-4: 22.5 Gbit/s Full-duplex (2019)
Style
Serial
Width in bits
1

Topics to explore

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Overview

Introduction

Identification and addressing

Nearline SAS

Comparison with parallel SCSI

Comparison with SATA

Characteristics

Advanced semantic analysis

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Map overview Semantic statistics

Serial Attached SCSI

Nodes63
Edges62
Triples51
Avg. degree1.97
Density0.031746
Components1

How this topic connects Entity context

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Serial Attached SCSI

Top relations

related to SAS expanders · 12
Serial Attached SCSI → An, Each, Expanders, For, SAS, SAS Expanders, SAS Management Protocol, SAS-2, SAS/SATA, Serial Attached SCSI Expanders, Serial SCSI Protocol, The
related to Technical details · 11
Serial Attached SCSI → PHY, SAS, SATA, SCSI, Serial ATA Tunneling Protocol, Serial Management Protocol, Serial SCSI Protocol, SMP, SSP, STP, The Serial Attached SCSI
related to External links · 9
Serial Attached SCSI → Forum, ProjectsSerial Attached SCSI, SAS, SCSI Storage Interfaces, SCSI Trade Association, SNIA SCSI Trade Association, STA Forum, T10, Wayback Machine
related to Introduction · 7
Serial Attached SCSI → An, Expanders, I/O, Initiators, SAS, SAS End, Typically
Speed · 4
Serial Attached SCSI → SAS-1: 3 Gbit/s Full-duplex (2004), SAS-2: 6 Gbit/s Full-duplex (2010), SAS-3: 12 Gbit/s Full-duplex (2014), SAS-4: 22.5 Gbit/s Full-duplex (2019)
Hotplugging interface · 1
Serial Attached SCSI → Yes
No. of devices · 1
Serial Attached SCSI → 65,535
Style · 1
Serial Attached SCSI → Serial
Width in bits · 1
Serial Attached SCSI → 1

Important terminology Word statistics

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Important terminology

sas scsi sata devices port expanders device serial expander protocol parallel connected initiator target ata drives routing subtractive command may

Entity relationships Subject–Predicate–Object triples

SubjectPredicateObjectConfidenceSrc
Serial Attached SCSIHotplugging interfaceYes1.00infobox
Serial Attached SCSINo. of devices65,5351.00infobox
Serial Attached SCSISpeedSAS-1: 3 Gbit/s Full-duplex (2004)1.00infobox
Serial Attached SCSISpeedSAS-2: 6 Gbit/s Full-duplex (2010)1.00infobox
Serial Attached SCSISpeedSAS-3: 12 Gbit/s Full-duplex (2014)1.00infobox
Serial Attached SCSISpeedSAS-4: 22.5 Gbit/s Full-duplex (2019)1.00infobox
Serial Attached SCSIStyleSerial1.00infobox
Serial Attached SCSIWidth in bits11.00infobox
hard disk drivesinstance ofis a point-to-point serial protocol that moves data to and from computer-storage devices0.80text
solid-state drivesinstance ofis a point-to-point serial protocol that moves data to and from computer-storage devices0.80text
tape drivesinstance ofis a point-to-point serial protocol that moves data to and from computer-storage devices0.80text
CD/DVD drives.SAS hardware allows multipath I/O to devices while SATAinstance ofHowever SCSI commands may be tunneled through ATAPI for devices0.80text

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    Min side: 3
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