HP StorageWorks HSG80 ACS Solution Software V8.8 for IBM AIX Installation and Configuration Guide (AA-RV1HA-TE, March 2005)

Planning Storage Configurations
67HSG80 ACS Solution Software V8.8 for IBM AIX Installation and Configuration Guide
Addressing Conventions for Device PTL
The HSG80 controller has six SCSI device ports, each of which connects to a
SCSI bus. In dual-controller subsystems, these device buses are shared between
the two controllers. (The StorageWorks Command Console calls the device ports
“channels.”) The standard BA370 enclosure provides a maximum of four SCSI
target identifications (ID) for each device port. If more target IDs are needed,
expansion enclosures can be added to the subsystem. For an example of how units
are mapped to physical disk drives, see Figure 20.
Figure 20: Mapping a unit to physical disk drives
The HSG80 controller identifies devices based on a Port-Target-LUN (PTL)
numbering scheme, shown in Figure 21. The physical location of a device in its
enclosure determines its PTL.
■ P—Designates the controller's SCSI device port number (1 through 6).
■ T—Designates the target ID number of the device. Valid target ID numbers
for a single-controller configuration and dual-redundant controller
configuration are 0–3 and 8–15, respectively. (This applies to the BA370
cabinet only.)
D100
RAID1
Disk 10000
Disk 20000 Disk 30000
Storageset
name
Host addressable
unit number
Controller
PTL addresses
CXO6186B