IBM Advanced SerialRAID/X, Installation Manual

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If a disk drive fails, or is turned off, the loop is broken, and one of the data paths to a
particular disk drive is no longer available. The disk drives on the remainder of the loop
continue to work, but an error is reported to the system.
In Figure 3 on page 33, disk drive number 3 has failed. Disk drives 1 and 2 can
communicate with the using system only through connector A1 of the SSA adapter. Disk
drives 4 through 8 can communicate only through connector A2 of the SSA adapter.
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 2. SSA Loop
32
IBM Advanced SerialRAID/X Adapter: Installation Guide