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Compaq HSZ80 Array Controller ACS Version 8.3 Configuration and CLI Reference Guide
When your controller receives an I/O request, it identifies the storageset unit number
for the request, then correlates the unit number to the storageset name. From the
storageset name, the controller locates the appropriate device for the I/O request. (For
example, the RAIDset “RAID1” might contain DISK10000, DISK20000, and
DISK30000.) The controller generates the read or write request to the appropriate
device using the PTL addressing convention. Figure 3–13 illustrates the concept of
PTL addressing.
Figure 3–13. Locating Devices using PTLs
D100
RAID1
Disk 10000
Disk 20000 Disk 30000
Storageset
name
Host addressable
unit number
Controller
PTL addresses
CXO6186A