Hitachi Virtual Storage Platform G1000 Hardware Manual page 122

Figure 36 Example of a separated controller and drive-only rack
configuration
Separated racks in a dual controller configuration
A dual controller configuration contains two controllers installed into a single
rack. The dual controller configuration can include up to two flash memory
drive chassis in the same rack and separate racks containing only drive
chassis.
The following figure shows a dual controller configuration with extended SAS
optical cables connecting between rack R0 (containing both primary and
secondary controllers) and rack R1 (containing two drive chassis) and rack L0
(containing three drive chassis). To avoid any I/O latency issues the sum of
the length of all cables (controller-to-drive chassis cable and drive chassis-to-
drive chassis cable) cannot exceed 125 meters.
122 Cable connection guidelines
Hitachi Virtual Storage Platform G1000, G1500, and Virtual Storage Platform F1500 Hardware Guide