7. SAS daisy chain – port 1 of I/O module B on the top D2600 connects to port 2 of I/O module B on the bottom
D2600 and port 1 of I/O module A on the top D2600 connects to port 2 of I/O module A on the bottom D2600
8. Connection from the P822 controller to port 2 of I/O module A on the top D2600 in Group 1
Figure 30 (page 36) illustrates best performance. The difference between this cabling and fault
tolerance cabling is that the beginning and ending connections from the controller to a disk enclosure
are always to the first disk enclosure in the group. Essentially, the request from the controller to a
disk enclosure moves faster because it does not have to travel through a series of disk enclosures.
However, this cabling does not provide fault tolerance. If an I/O module in the first disk enclosure
fails, you will lose access to all disk enclosures in the group.
NOTE: The cabling diagram in Figure 30 (page 36) is exactly the same for the HP StoreEasy
1430 and 1630 using the P822 controller.
Cabling the storage system 35
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