SCSI命令概述翻译.pptVIP

TEST UNIT READY Command Also: CHECK CONDITION – NOT READY – POWER ON OCCURED INQUIRY Command OP Code: 12h Specifies the Command EVPD: Enable Vital Product Data Set to zero, the device returns standard inquiry data Set to one, enables the page code field 设置为0，设备返回普通的询问信息 设置为1，启用页面代码字段 INQUIRY Command Page Code: Specifies the page code to return. Pages are defined in SAM-4, SPC-4, and technology specific standards Allocation Length specifies the length of inquiry data the initiator is prepared to accept in bytes 定位长度决定了发起者准备接收的询问信息的长度 REPORT LUNS Command OP Code: A0h Specifies the command Select Report: REPORT LUNS Command Allocation Length should be at least 16 bytes If the allocation length is insufficient to report all the LUNs on the device, the device shall report only what it is able to report 翻译：定位长度至少要有16字节 翻译：如果定位长度不足以报告设备上所有的逻辑单元，硬盘应该只报告它可以报告的单元 Additional Sense Codes Values returned in a Response Frame (SAS) in the event that a command could not be completed So many possible problems that a qualifier is used to expand the pool of possible returns 翻译：在一个指令无法完成的活动中，值在应答框架中返回 翻译：由很多可能存在的问题因此修饰符通常用于扩展返回问题池 Additional Sense Codes Examples ASC: 0x00 ASCQ: 0x06 I/O Process Terminated ASC: 0x04 ASCQ: 0x11 Logical Unit Not Ready, Notify (Enable Spinup) Required ASC: 0x4B ASCQ: 0x03 ACK/NAK Timeout THANK YOU SUCCESS * * 可编辑 * SCSI Overview Improving Networks Worldwide. * SCSI Overview 可编辑 * SCSI Overview 可编辑 UNH 互操作性实验室 SCSI 命令概述 物理 物理层 数据链路层 数据传输层 应用层 陈述主题 命令摘要 命令选择释义 附加意义上的代码及资格 CDB 命令数据程序块 命令由CDBs定义 每个对象都有他自己的 CDB CDBs 由多种SCSI标准定义 拥有固定和变化的长度变量 In SAS: 囊括在一个指令框架中 SCSI Command Sets SPC-4 SCSI Primary Commands Version 4 命令对于所有的方法类型普遍适用 SBC-3 SCSI Block Command Version 3 命令针对特定的块设备 (硬盘) SSC-2 SCSI Streaming Commands Version 2 命令针对特定的流设备(磁盘驱动) MMC-4 SCSI Multi Media Commands Version 4 命令针对特定的多媒体设备(CD/DVD) Common SCSI Commands in SAS Read Commands READ (6) (SSC and SBC)* READ (10) (SBC) READ (12) (SBC) READ (16) (SBC) READ (32) (SBC) *不同的域定义使用相同的 CDB长度 Command