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SCSI Standards Architecture (*)
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(*) This chart reflects the currently approved SCSI project family.
T10 is responsible for all projects, except:
IEEE is responsible for IEEE 1394; T11 responsible for Fibre Channel;
Internet Engineering Task Force (IETF) is responsible for iSCSI and the Internet; and
InfiniBand Trade Association is responsible for InfiniBand (tm).
Note that the original third-generation SCSI standards used the name SCSI-3 to distinguish
them from SCSI-2. Subsequent SCSI standards have dropped the '-3' from their
names because it was cumbersome. So, when the SCSI-3 Architecture Model (SAM) was
revised, it became the SCSI Architecture Model - 2 (SAM-2). While the
individual components of the SCSI family continue to evolve, there is
no SCSI-4 project envisioned.
DOCUMENT LINKS
Command Sets:
SBC
SCSI-3 Block Commands
[color="#00b000"][first generation disk drive command set]
SBC-2
SCSI Block Commands - 2
[second generation disk drive command set]
SBC-3
SCSI Block Commands - 3
[third generation disk drive command set]
RBC
Reduced Block Commands
[simplified disk drive command set]
RBC_AM1
Reduced Block Command Set Amendment 1
[first amendment to above standard]
SSC
SCSI-3 Stream Commands
[first generation tape drive command set]
SSC-2
SCSI Stream Commands - 2
[second generation tape drive command set]
SSC-3
SCSI Stream Commands - 3
[third generation tape drive command set]
SMC
SCSI-3 Media Changer Commands
[first generation jukebox command set]
SMC-2
SCSI Media Changer Commands - 2
[second generation jukebox command set]
SMC-3
SCSI Media Changer Commands - 3
[third generation jukebox command set]
MMC
Multi-Media Commands
[first generation CD-ROM command set]
MMC-2
Multi-Media Commands - 2
[second generation CD and DVD command set]
MMC-3
Multi-Media Commands - 3
[third generation CD and DVD command set]
MMC-4
Multi-Media Commands - 4
[fourth generation CD and DVD command set]
MMC-5
Multi-Media Commands - 5
[fifth generation CD and DVD command set]
SCC-2
SCSI Controller Commands - 2
[second generation RAID controller command set]
SES
SCSI-3 Enclosure Commands
[command set for enclosures (fans, power supplies, etc.]
SES_AM1
SCSI-3 Enclosure Commands Amendment # 1
[first amendment to above standard]
SES-2
SCSI-3 Enclosure Commands - 2
[second generation command set for enclosures (fans, power supplies, etc.]
OSD
Object-Based Storage Devices
[object-oriented (e.g., files) command set for disk drives]
OSD-2
Object-Based Storage Devices - 2
[second generation object-oriented (e.g., files) command set for disk drives]
BCC
Bridge Controller Commands
[command set for SCSI bridges between protocols]
ADC
Automation/Drive Interface - Commands
[command set for the Automation/Drive interface]
ADC-2
Automation/Drive Interface - Commands - 2
[second generation command set for the Automation/Drive interface]
Primary Command Sets:
SPC
SCSI-3 Primary Commands
[first generation command set for all SCSI devices]
SPC-2
SCSI Primary Commands - 2
[second generation command set for all SCSI devices]
SPC-3
SCSI Primary Commands - 3
[third generation command set for all SCSI devices]
SPC-4
SCSI Primary Commands - 4
[fourth generation command set for all SCSI devices]
Architectural Models:
SAM
SCSI-3 Architecture Model
[first generation architectural model for SCSI devices]
SAM-2
SCSI Architecture Model - 2
[second generation architectural model for SCSI devices]
SAM-3
SCSI Architecture Model - 3
[third generation architectural model for SCSI devices]
SAM-4
SCSI Architecture Model - 4
[fourth generation architectural model for SCSI devices]
Parallel Interface:
SPI-2
SCSI Parallel Interface - 2
[second generation parallel interface (Ultra2)]
SPI-3
SCSI Parallel Interface - 3
[third generation parallel interface (Ultra3 or Ultra160)]
SPI-4
SCSI Parallel Interface - 4
[fourth generation parallel interface (Ultra320)]
SPI-5
SCSI Parallel Interface - 5
[fifth generation parallel interface (Ultra640)]
Parallel Interface Related Standards and Technical Reports:
SDV
SCSI Domain Validation
[technical report on discovering maximum supported speeds]
PIP
SCSI Passive Interconnect Performance
[standard on testing and measuring cables, connectors, etc.]
SSM
SCSI Signal Modeling
[technical report on modeling SCSI signals]
SSM-2
SCSI Signal Modeling - 2
[standard on modeling SCSI signals]
EPI
SCSI Enhanced Parallel Interface
[technical report on enhancements to the parallel interface]
IEEE 1394:
SBP-2
Serial Bus Protocol - 2
[second generation protocol for transporting SCSI over IEEE 1394]
SBP-3
Serial Bus Protocol - 3
[third generation protocol for transporting SCSI over IEEE 1394]
Fibre Channel (FC):
FCP
Fibre Channel Protocol
[first generation protocol for transporting SCSI over Fibre Channel]
FCP-2
Fibre Channel Protocol - 2
[second generation protocol for transporting SCSI over Fibre Channel]
FCP-3
Fibre Channel Protocol - 3
[third generation protocol for transporting SCSI over Fibre Channel]
Serial Storage Architecture (SSA):
SSA-S3P
SSA SCSI-3 Protocol
[protocol for transporting SCSI over SSA]
SSA-TL2
SSA Transport Layer - 2
[second generation SSA transport layer]
SSA-PH1
SSA Physical Layer 1
[first generation SSA physical layer]
SSA-PH2
SSA Physical Layer 1
[second generation SSA physical layer]
SCSI Remote Direct Memory Access Protocol:
SRP
SCSI RDMA Protocol
[protocol for transporting SCSI over RDMA interfaces, e.g., InfiniBand (tm)]
SRP-2
SCSI RDMA Protocol - 2
[second generation protocol for transporting SCSI over RDMA interfaces, e.g., InfiniBand (tm)]
Serial Attached SCSI:
SAS
Serial Attached SCSI
[protocol and physical interface for transporting SCSI over serial links]
SAS-1.1
Serial Attached SCSI - 1.1
[SAS protocol and physical interface enhancements for transporting SCSI over serial links]
SAS-2
Serial Attached SCSI - 2
[SAS protocol and physical interface enhancements for transporting SCSI over serial links (up to 6 Gb/sec)]
Automation/Drive Interface:
ADT
Automation/Drive Interface - Transport Protocol
[protocol/transport principally for Automation/Drive Commands]
ADT-2
Automation/Drive Interface - Transport Protocol - 2
[second generation protocol/transport principally for Automation/Drive Commands]
SCSI Management:
The Serial Attached SCSI Driver Interface (SDI) defines a set of
functions provided by a device driver to allow management applications
low-level access to the Serial Attached SCSI (SAS) infrastructure.
SDI
SCSI Driver Interface (SDI)
[first generation of SDI]
SCSI / ATA Translation:
SCSI / ATA Translation (SAT) is a software translation layer that maps
ATA devices to make them appear to be SCSI devices:
SAT
SCSI / ATA Translation
[first generation of SAT]
About SCSI-2:
SCSI-2 is the predecessor to the SCSI-3 family of standards. It is a
single standard containing all SCSI architecture layers for only the
parallel interface. There is a companion standard for SCSI-2 called the
SCSI-2 Common Access Method and SCSI Interface Module (CAM) that
describes a layered software driver method for usage with SCSI-2. While
most software drivers today do not exactly conform to CAM, they generally
do follow its layered concepts:
SCSI-2
Small Computer System Interface - 2
[second generation of SCSI]
CAM
SCSI-2 Common Access Method and SCSI Interface Module
[software layering standard]
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