Filter
Top Products
72 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
HPHP
HPHP
HPHP
HPHP
HPHP HPHP
Slot 1
Slot 2
Slot 4
Slot 5
Fibre
channel
Fibre
channel
ESCON
ESCON
I/O enclosure 3
HP HP
HP HP
HP HP
HP HP
HP HPHP HP
Slot 2
Slot 1
Slot 5
Slot 4
Fibre
channel
Fibre
channel
ESCON
ESCON
RIO-G
RIO-G RIO-G
RIO-G
RIO-G
RIO-G
RIO-G