IBM DS4500 Drive-side fibre-channel cabling, Host Host 2, Host Adapter 1 Host 3, Host Adapter 1

Host 1, Host Adapter 1 and 2 Host 4, Host Adapter 1 and 2

Host 1 Host 4

! OUT 2 Gb/s1 Gb/s

2 Gb/s1 Gb/s!	2 Gb/s1 Gb/s!	2 Gb/s1 Gb/s!
OUT	OUT	OUT

! OUT 2 Gb/s1 Gb/s

! OUT 2 Gb/s1 Gb/s

! OUT 2 Gb/s1 Gb/s

! OUT 2 Gb/s1 Gb/s

IN IN IN IN IN IN IN IN

Host 2 Host 3

Host 2, Host Adapter 1 and 2 Host 3, Host Adapter 1 and 2

Figure 3. DS4500 Storage Subsystem host adapter connections (direct-attached)

For additional information about host-side cabling, refer to the IBM TotalStorage DS4500 Fibre Channel Storage Subsystem Installation and Support Guide.

Drive-side fibre-channel cabling

The DS4500 Storage Subsystem supports up to two redundant drive loops. A redundant drive loop consists of one or more storage expansion enclosures connected to a controller using two sets of fibre channel cables. If one data path fails, the controller uses the other data path to maintain the connection to the drive group.

This section provides information on the following two topics:

v“Drive interface ports” on page 5

v“Overview: Cabling a DS4500 with four drive mini hubs” on page 6

v“Overview: Cabling a DS4500 with two drive mini hubs” on page 8

v“Configuring the drive loops” on page 10

v“Connecting a redundant drive loop to the DS4500” on page 13

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