IBM DS8000 - Manual (Page 181)

Chapter 9. Configuration planning 159
as shown. To interconnect two DS8000 base frames, FC1190 would provide a pair of 31m
Ethernet cables to connect from port 16 of each switch in the second base frame into port 15
of the first frame. If the second S-HMC is installed in the second DS8000, it would remain
plugged into port 1 of
its Ethernet switches.
Figure 9-1 S-HMC and Ethernet switches
9.2.1 External S-HMC
Additionally, the DS8000 can have an external S-HMC (feature code 1110), which may be
ordered today in preparation for its availability later in 2005 when this will be a supported
configuration. The external S-HMC is equivalent hardware to the internal S-HMC and needs
to be installed in a customer-supplied 19-inch IBM or a non-IBM rack (1U server/1U display).
Configuration management is achieved either in real-time or offline configuration mode.
In environments with high availability requirements and Advanced Copy Services, it is
recommended that an external S-HMC is installed to eliminate single points of failure. Since
the S-HMC is the only service personnel interface available, an external S-HMC will greatly
enhance maintenance operational capabilities as a result of internal S-HMC failures. The
external S-HMC is an optional priced feature. To help preserve console functionality, the
external and the internal S-HMCs are not available to be used as a general purpose
computing resource.
SFI-1
Port for
Customer
Network
Pair of Ethernet switches
Ports for S-HMC #2
Ethernet ports for private
S-HMC network
SFI-1
SFI-1
SFI-2
SFI-2
S-HMC
S-HMC and a pair of Ethernet switches
- Storage Facility Image (SFI)
Tip: To ensure that IBM service representatives can quickly and easily access an external
S-HMC, place the external S-HMC rack within 15.2 m (50 ft.) of the storage units
connected to it.