HP 6400/8400 HP StorageWorks 6400/8400 Enterprise Virtual Array expansion rack - Page 21

Cabling disk enclosures in the expansion rack, EVA6400

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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. Figure 17 shows how the disk enclosures within each loop are connected. NOTE: The numbering shown in Figure 17 is for the physical shelf location and may not reflect the I/O module numbering. HP StorageWorks 6400/8400 Enterprise Virtual Array expansion rack reference guide 21

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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.
Figure 17
shows how the disk
enclosures within each loop are connected.
NOTE:
The numbering shown in
Figure 17
is for the physical shelf location and may not reflect the I/O
module numbering.
HP StorageWorks 6400/8400 Enterprise Virtual Array expansion rack reference guide
21