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1.2 Names and identifiers
C141-C013 29
1.2 Names and identifiers
Device names are worldwide unique names for devices within a transport
protocol. Port names are worldwide unique names for ports within a transport
protocol. Port identifiers are the values by which ports are identified within a
domain, and are used as SAS addresses. Phy identifiers are unique within a
device.
1.2.1 SAS addresses
Table 1.1 defines the SAS address format. SAS addresses shall be compatible
with the NAA (Name Address Authority) IEEE Registered format identification
descriptor defined in SPC-3. The SAS address shall be worldwide unique. A SAS
address of 00000000_00000000h indicates an invalid SAS address.
Table 1.1 SAS address format
Bit
Byte
7 6 5 4 3 2 1 0
0 NAA (5h) (MSB)
1
2
IEEE COMPANY ID
3 (LSB) (MSB)
4
5
6
7 (LSB)
SAS addresses represent any types of WWNs: a device SAS address representing
a device address, a port SAS address representing Port-A, or a port SAS address
representing Port-B.
− device SAS address: 5CCC CCCX XXXX XXX yy00
− port SAS address (Port-A): 5CCC CCCX XXXX XXX yy10
− port SAS address (Port-B): 5CCC CCCX XXXX XXX yy11
C = 4 bits: Company ID
X = 4 bits: Serial number for WWN
y = 1 bit: Reserved