（一）什么是SAS       SAS（Serial Attached SCSI）即串行SCSI技术，是一种磁盘连接技术，它综合了并行SCSI和串行连接技术（如FC、SSA、IEEE1394等）的优势，以串行通讯协议为协议基础架构，采用SCSI-3扩展指令集，并兼容SATA设备，是多层次的存储设备连接协议栈。       说到SAS，自然会联想到在存储上广泛使用的另外一种磁盘通道连接技术：FC（光纤通道），这里将2种磁盘通道连接技术做一个简单的对比。       FC       优点：基于Fabric Channel环路协议基础上的串行技术，通过给后端磁盘提供带宽2.0G

USB 3.0 new protocol for mass storage device

这是一本学习SAS协议的入门书籍，很不错的。 英文版

i have attached the code for fcm

NAS（NETWORK ATTACHED STORAGE：网络附属存储）是一种将分布、独立的

SAS is a scalable serial interconnect used to move data to, from and within storage devices and systems. 12Gb/s SAS is raising storage performance for I/O-intensive applications, virtualized, and big data environments. It provides double the data transfer rate of 6Gb/s SAS solutions and enables the SAS infrastructure to deliver bandwidth that exceeds that of PCI Express® 3.0. Single drive, single port tests have shown sequential read performance topping 150,000 IOPS and 1,000MB/s. These single lane performance levels are very similar to those of the PCI Express-based storage cards emerging today, while x8 12Gb/s SAS host bus adapters (HBAs) based on this technology are achieving in excess of 1M IOPS. These results are further pushing the limits of extremely scalable platforms and enabling a higher performing class of tiered storage, ranging from mega datacenter scale-out architectures to ultra high-performance solid state solutions. 12Gb/s SAS provides the added performance, scalability, and reliability required for enterprise storage.

USB Attached SCSI,了解SCSI必须知道协议规范

This standard describes a SCSI transport protocol (see SAM-4) for USB-2 and USB-3

题目：https://adworld.xctf.org.cn/task/task_list?type=reverse&number=4&grade=0&page=1 我的解题记录：https://www.yuque.com/jianouzuihuai/study/qffkcv

Working Draft Project American National T10/2212-D Standard Information technology - Serial Attached SCSI - 3 (SAS-3)