Ibm DS8000 Manuel d'utilisateur télécharger pdf (Page 94)

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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

Slot 1

Slot 2

Slot 4

Slot 5

Fibre

channel

Fibre

channel

ESCON

I/O enclosure 3

HP HP

HP HPHP HP

Slot 2

Slot 1

Slot 5

Slot 4

Fibre

channel

Fibre

channel

ESCON

RIO-G

RIO-G RIO-G

RIO-G

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Ibm DS8000 Manuel d'utilisateur Page 94

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