Compaq HSZ80 manual Locating Devices using PTLs

3–39

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 3–13illustrates the concept of PTL addressing.

D100	Host addressable
	unit number

RAID1Storageset name

Controller

PTL addresses

Disk 10000 Disk 20000 Disk 30000

CXO6186A

Figure 3–13. Locating Devices using PTLs

Compaq HSZ80 Array Controller ACS Version 8.3 Configuration and CLI Reference Guide