IBM TOTALSTORAGE DS4500 - Manual (Page 4)

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Host 1, Host Adapter 1 and 2 Host 4, Host Adapter 1 and 2
Host 2, Host Adapter 1 and 2 Host 3, Host Adapter 1 and 2
Host 1 Host 4
Host 2 Host 3
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
Figure 3. DS4500 Storage Subsystem host adapter connections (direct-attached)
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