The INCITS T10 committee website is at http://www.t10.org/. Among the draft documents available at this website are excellent versions of the SCSI Architecture Model (SAM). A great deal of open-system storage operating theory can be derived by reading the SAM documents.
The following is a list of subject areas under development as T10 standards that have documents available on the T10 committee website:
SBC SCSI Block Commands (disk drive commands)
RBC Reduced Block Commands (simplified disk drive commands)
SSC SCSI Stream Commands
SMC SCSI Media Changer Commands
MMC Multimedia Commands
SCC SCSI Controller Commands
SES SCSI Enclosure Services
OSD Object-based Storage Devices
MSC Management Server Commands
ADC Automation/Drive Interface Commands
ADT Automation/Drive Interface Transport Protocol
SPC SCSI Primary Commands
SAM SCSI Architecture Model
SPI SCSI Parallel Interface
SDV SCSI Domain Validation
PIP SCSI Passive Interconnect Performance
SSM SCSI Signaling Model
EPI SCSI Enhanced Parallel Interface
SBP Serial Bus Protocol
FCP Fibre Channel Protocol
SSA Serial Storage Architecture Protocol
SRP SCSI RDMA Protocol
SAS Serial Attached SCSI
CAM SCSI Common Access Method