Cabling Disk Enclosures In The Expansion Rack; Eva6400 - HP 6400/8400 Reference Manual

Cabling disk enclosures in the expansion rack

As in the main rack, the disk enclosures in the expansion rack should be balanced across loops —
two loops for the EVA6400 and three loops for the EVA8400. The diagrams in this section show the
disk enclosures balanced across loops, in preparation for connecting to the controllers and disk
enclosures in the main rack.
Consider the following:
In these cabling procedures, the left side of the disk enclosure (I/O module A) is cabled and then
the right side (I/O module B) is cabled. However, because this cabling is completed before power
is applied to the rack, either I/O module can be cabled first.
As a general cabling guideline, the P1 port on the I/O module receives input from another I/O
module or return connection to a controller and the P2 port is used for output to another I/O
module or return connection to a controller.
When balancing expansion rack disk enclosures across loops, the P1 ports on the top disk enclosure
in the loop and the P2 ports on the bottom disk enclosure in the loop remain open to connect to
either the controllers or the disk enclosures in the main rack.

EVA6400

The EVA6400 requires that disk enclosures be balanced across two loops. With six disk enclosures
in an expansion rack, there should be three disk enclosures per loop.
enclosures within each loop are connected.
NOTE:
The numbering shown in
module numbering.
HP StorageWorks 6400/8400 Enterprise Virtual Array expansion rack reference guide
Figure 17 is for the physical shelf location and may not reflect the I/O
Figure 17 shows how the disk
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