HP Surestore Disk Array 12h and FC60 - Manual (Page 208)

208 Verifying Disk Array Connection
Interpreting Hardware Paths
Each component on the disk array is identified by a unique hardware path. The
interpretation of the hardware path differs depending on the type of addressing used to
access the component. Two types of addressing are used with the Disk Array FC60:
• Peripheral Device Addressing (PDA) - used to address the disk array controller
modules.
• Volume Set Addressing (VSA) - used to address the disk array LUNs
Because each controller module is identified by a unique loop address, the disk array is
identified by two hardware paths.
Peripheral Device Addressing
Peripheral device addressing (PDA) is used to identify the disk array controller modules. A
disk array controller module can be identified in the ioscan output as an entry with a driver
type of
sctl
and a description of HP A5277A. Figure 80 illustrates the interpretation of
the fields in the hardware path when using PDA.
Figure 80 Peripheral Device Addressing Hardware Path
8/12.8.0.255.1.2.0
Bus Converter
Adapter
Protocol Type (8 = mass storage)
Port (255 = the target connected directly to the FC)
Bus (Upper 4 bits of the loop ID)
Target (Lower 4 bits of the loop ID)
Area (0 = point-to-point or private loop)
Not Used (LUN - Logical Unit Number of disk)
Peripheral Device Addressing (PDA) Hardware Path