Single-controller and dual-controller connections via SAS switch:
The illustration Figure 51 shows the connections from the host server to the
dual-controller or single-controller DS3500 using one SAS switch. This figure also
illustrates the use of the SAS switch to allow the host server connected to multiple
DS3500s.
The illustration Figure 52 on page 63 shows the connections from the host server to
the dual-controller DS3500 using two SAS switches that are not connected together.
Host system
with dual host
adapters
DS3500
Host system
with dual host
adapters
Figure 50. Dual-controller direct-attached SAS connections to multiple HBAs in multiple hosts
SAS switch
Host system
with one SAS
host adapter
Host system
with one SAS
host adapter
DS3500
with Dual-
controller
DS3500
with Single-
controller
e35i0011
Figure 51. Dual-controller DS3500 or single-controller DS3500 SAS connection to multiple
hosts using one SAS switch
62 IBM System Storage DS3500 and EXP3500 Storage Subsystem: Installation, User's, and Maintenance Guide
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