HP Direct-Connect External SAS Storage for HP BladeSystem Solutions Depoyment Guide

MSA2000 with double-density servers
This example illustrates recommended cabling when using double-density server blades with shared
storage enclosures such as the MSA2000sa. In this configuration, note the following:
• This example shows a dual-controller MSA2012sa controller enclosure and standard cabling.
MSA2300sa controller enclosures (standard and optimal cabling) and single-controller devices
are also supported.
• Due to limited ports on the MSA2012sa controller, only standard cabling is available. Standard
cabling offers high availability, but, during a failover, there will be a slight performance
reduction.
• For best possible performance, use G2 MSA2300sa controller enclosures. Because the
MSA2300sa controller includes four SAS ports, optimal cabling can be used, ensuring
best-possible availability.
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.)
MSA2000 with double-density servers 111