IBM Advanced SerialRAID/X, Installation Manual

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Rules for SSA Loops
For SSA loops that include the IBM Advanced SerialRAID/X Adapter, the following rules
apply:
v
Each SSA loop must be connected to a valid pair of connectors on the SSA adapter
(that is, either connectors A1 and A2, or connectors B1 and B2).
v
A maximum of 48 disk drives can be connected in a particular SSA loop.
v
If you are not using RAID-0 arrays, a second pair of adapter connectors can be
connected in a particular SSA loop. The second adapter must be another IBM
Advanced SerialRAID/X Adapter. If an adapter is connected in two SSA loops and
each loop contains a second adapter, the same two adapters must be in both loops,
as shown in Figure 5 on page 35.
U s in g s y s te m
D is k
1
D is k
2
D is k
3
D is k
4
D is k
5
D is k
6
D is k
7
D is k
8
A1 A2 B1 B2
Figure 4. SSA Loop with two failed disks
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IBM Advanced SerialRAID/X Adapter: Installation Guide
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