SCSI Report LUNs Command - AbsoluteAstronomy.com

The Report LUNs Command is a part of the SCSI command structure

SCSI command

In SCSI computer storage, a command is the basic unit of communication. The SCSI command architecture was originally defined for parallel SCSI buses but has been carried forward with minimal change for use with Fibre Channel, iSCSI and Serial Attached SCSI....

The CDB structure is:

SCSI Report LUNs Command
bit Bit A bit is the basic unit of information in computing and telecommunications; it is the amount of information stored by a digital device or other physical system that exists in one of two possible distinct states... → ↓byte Byte The byte is a unit of digital information in computing and telecommunications that most commonly consists of eight bits. Historically, a byte was the number of bits used to encode a single character of text in a computer and for this reason it is the basic addressable element in many computer...	0	1	2	3	4	5	6	7
+0	Operation Code = 0xA0
+1	Reserved
+2	Select Report
+3	Reserved
+4
+5
+6	Allocation Length
+7
+8
+9
+10	Reserved
+11	Control

The Select Report field specifies the type of logical unit addresses to be returned.

00h, returned list contains logical units with the following addressing
Address space
In computing, an address space defines a range of discrete addresses, each of which may correspond to a network host, peripheral device, disk sector, a memory cell or other logical or physical entity.- Overview :...

methods
1. logical unit addressing method
2. peripheral device addressing method
3. flat space addressing method
01h, returned list contains only well known logical units
02h, returned list contains all logical units
03h-FFh, reserved

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