Specifications

3–9
Compaq HSG80 Array Controller ACS Version 8.4 Configuration and CLI Reference Guide
When your controller receives an I/O request, it identifies the host logical unit
number, listing all the storageset names in the logical unit. Using the unit number, the
controller locates the appropriate device for the I/O request. For example in
Figure 3–5, a RAIDset called 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 3–5 Locating Devices using PTLs
Table 3–2 Key to Figure 3–5 Locating Devices using PTLs
Item Description
➀ Host unit number
➁ Storageset name
➂ Physical devices using controller PTL addresses
D100
RAID1
Disk 10000
Disk 20000 Disk 30000
CXO6186B
2
3
1