I/o enclosure 2, I/o enclosure 3, Single pathed host – IBM DS8000 User Manual

Page 94

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DS8000 Series: Concepts and Architecture

Figure 4-5 Single pathed host

It is always preferable that hosts that access the DS8000 have at least two connections to
separate host ports in separate host adapters on separate I/O enclosures, as depicted in
Figure 4-6 on page 73. In this example, the host is attached to different Fibre Channel host
adapters in different I/O enclosures. This is also important because during a microcode
update, an I/O enclosure may need to be taken offline. This configuration allows the host to
survive a hardware failure on any component on either path.

HBA

Single pathed host

Server
owning all
even LSS
logical
volumes

Server
owning all
odd LSS
logical
volumes

RIO-G

I/O enclosure 2

Slot 1

Slot 2

Slot 4

Slot 5

Fibre
channel

ESCON ESCON

I/O enclosure 3

HP HP