HP StoreEasy 1000 Getting Started Manual page 20

Figure 13 StoreEasy 1x50 with the P441 controller in a dual domain configuration (best
fault tolerance)
1. P441 controller
2. Connection from P441 controller to port 2 of I/O module B on top of the disk enclosures in Group 2
3. Group 1 of 4 D2000/D3000 enclosures
4. Group 2 of 4 D2000/D3000 enclosures
5. Connection from P441 controller to port 2 of I/O module A on top of the disk enclosures in Group 1
6. Connections between the disk enclosures in Group 1
7. Connections between the disk enclosures in Group 2
Figure 14 (page 21)
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
and 1640 using the P822 controller.
20 Setup and install
illustrates best performance. The difference between this cabling and fault
Figure 14 (page 21) is exactly the same for the StoreEasy 1440