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3–38 Creating Storagesets
Figure 3–12. PTL Addressing in an Extended Configuration
In Figure 3–12, the controller addresses DISK30800 through device port 3, target 08,
LUN 00. This PTL location indicates the pathway the controller uses to address a disk
drive (device) in the subsystem. It also indicates the device name.
The controller uses the PTL location to name each device that you add to your
subsystem with StorageWorks Command Console or the CONFIG utility. (Factory-
installed devices are added with the CONFIG utility. Thus, their names derive from
their PTL locations.) For example, if the controller finds a disk in PTL 10200, it
names it DISK10200.
CXO5851B
Controller A
Controller B
EMU
PVA 0
Cache B Cache A
10300102001010010000
20300202002010020000
30300302003010030000
40300402004010040000
50300502005010050000
60300602006010060000
123456
3
2
1
0
EMU
PVA 2
11100110001090010800
21100210002090020800
31100310003090030800
41100410004090040800
51100510005090050800
61100610006090060800
123456
11
10
9
8
EMU
PVA 3
11500114001130011200
21500214002130021200
31500314003130031200
41500414004130041200
51500514005130051200
61500614006130061200
123456
15
14
13
12
PTL location = Device port number = 3
Target number = 08
LUN = 00
Device port numbers
Target
numbers