HP 2000sa Deployment Manual page 109

IMPORTANT: In all configurations using double-density servers, note the following:
Double-density server blades allow 32 servers in the 16 available device bays of a c7000
enclosure, by including both an "a" and a "b" server node on one blade device.
Switches in interconnect bays 5 and 6 map to the "a" server nodes in device bays 1–16.
(Referred to as servers 1a–16a.)
Switches in interconnect bays 7 and 8 map to the "b" server nodes in device bays 1–16.
(Referred to as servers 1b–16b.)
Devices and quantities
MSA2012sa controller enclosures: 2
MSA2000 drive enclosures: 6
c7000 enclosures: 1
3Gb SAS BL Switches: 4
Server blade types: double-density
Connection details
Switch in interconnect bay 5:
◦ Port 1: to MSA #2, SAS port A0
◦ Port 2: to MSA #1, SAS port A0
Switch in interconnect bay 6:
◦ Port 1: to MSA #2, SAS port B0
◦ Port 2: to MSA #1, SAS port B0
Switch in interconnect bay 7:
◦ Port 1: to MSA #2, SAS port A1
◦ Port 2: to MSA #1, SAS port A1
Switch in interconnect bay 8:
◦ Port 1: to MSA #2, SAS port B1
◦ Port 2: to MSA #1, SAS port B1
Notes
As shown, when connecting MSA2012
controllers to two pairs of SAS BL Switches,
only a single cable per switch can be
connected, because each controller has
only two ports, and needs to connect to
two different switches. This configuration
supports high availability, but, during a
failover, there will be a slight performance
reduction.
Shared storage—with double-density servers 109