Dell PowerVault 35F User Manual page 64

SCC Structures and Operation: Dell PowerVault 35F User's Guide
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Addressing, Structures and Operation: Dell PowerVault 35F User's Guide
SCC Addressing Option
Fibre Channel and SCSI systems employ different methods of addressing devices. The inclusion of a bridge or bridge
requires that a method of translating device IDs be implemented so that each SCSI device is mapped to the appropriate
Fibre Channel LUN. The SCSI buses establish bus connections between devices. Targets on a SCSI bus may internally
address logical units. The addressing of a specific SCSI device is represented by the BUS:TARGET:LUN triplet.
When a Fibre Channel initiator initializes on an arbitrated loop, the first order of business is to determine what devices
exist on the loop. Device discovery is performed, and an FCP target device list is built. Each device is queried for FCP
logical units. The logical units are the actual devices that the operating system will address. When an initiator
addresses a logical unit, the LUN field used is consistent in form with the SCC defined fields. All current Fibre
Channel host bus adapter drivers are consistent with these methods. The addressing used is the SCC Logical Unit
Addressing and Peripheral Device Addressing methods, shown in
only the first 2 bytes of the 8 byte FCP LUN are used.
Table 1. SCC Addressing structure
Table 2. Peripheral Device Addressing LUN structure
Table 3. SCC Logical Unit Addressing LUN structure
Table 4. Address Method definitions
Codes Description
00 Peripheral Device Addressing Method
01 Volume Set Addressing Method
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| Auto Assigned Addressing Option | Index Addressing Option
Table 1 and 2. First level addressing is supported, so