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182 DS8000 Series: Concepts and Architecture
Figure 9-13 DDM to DA mapping (2-way model)
Model 921 can have four DA pairs and 12 disk enclosure pairs (1 disk enclosure pair can
have 16 x 2 =32 DDMs). And each two disk enclosure pairs (64 DDMs) is connected to a DA
pair in order.
For example, the first 64 DDMs are connected to the DA pair 2, the next 64 DDMs are
connected to the DA pair 0, and so on. Therefore, a 256 DDMs configuration is a
well-balanced configuration (all four DA pairs have 64 DDMs).
If you install more than 256 DDMs in the DS8100, the next disk enclosures are connected to
the DA pair 2 again. When you have the maximum DDMs (384 DDMs), DA pair 0 and 1 have
128 DDMs and DA pair 2 and 3 have 64 DDMs.
Figure 9-14 on page 183 shows the DS8300 Model 922 (4-way model).
DDM to DA Mapping -- 2-way
0/1
1/0
3/2
2/3
2
2
0
0
3
3
1
1
2
2
0
0
S0
S1
disk enclosure pair
installation sequence
0/1
2
disk enclosure pair
(32 DDMs can be installed
2 means to attach to DA pair 2)
I/O drawer
(0/1 means device adapters for DA pair 0 and 1)
S0
Server
(0 means server 0)
Base Frame
Expansion Frame