All host and drive cabling connections require you to use SFP modules in the DS4800 host and drive
channels used by the cabling connections. The SFP module housing and fibre channel cable have
integrated guide keys that prevent you from inserting these devices incorrectly. Insert SFP modules into
ports with minimal pressure so that you do not damage either the SFP module or the port. You can insert
an SFP module into an active port without affecting the operational loop performance. You must connect
the fibre channel cable to the SFP module after you insert the SFP module into the port.
Attention: To avoid damage to your fibre-optic cables:
v Do not route the cable along a folding cable-management arm.
v Route the cable away from places where it can be damaged by other devices in the cabinet.
v For devices on slide rails, leave enough slack in the cable so that it does not bend to a diameter of less
than 76 mm (3 in.) or a radius less than 38 mm (1.5 in.) when extended or become pinched when
retracted.
v Do not use plastic cable ties in place of the provided cable straps.
v Do not put excess weight on the cable at the connection point. Be sure that the cable is well supported.
To
install an SFP module and fibre channel cable:
1. Remove the protective caps from the SFP module and from the fibre channel cable. Do not touch the
exposed fibre-optic cable.
2. Insert the SFP module into a DS4800 controller port.
3. Connect the fibre channel cable to the SFP module.
Redundant drive-side fibre channel cabling
Attention: Before powering on the DS4800, the storage subsystem must be cabled to at least one storage
expansion enclosure populated with at least two drives. All drives in the connected enclosure or
enclosures must contain no prior configuration data.
The IBM System Storage DS4800 Storage Subsystem Installation, User’s, and Maintenance Guide describes the
importance of redundant cabling and provides redundant cabling diagrams for connecting DS4000
storage expansion enclosures to your DS4800. Refer to “Connecting storage expansion enclosures to the
DS4800” on page 59, which provides diagrams of recommended topologies for 1, 2, 4, and 8 enclosures.
To ensure the optimal drive channel performance, please review the instructions, and particularly the
Attention information on page 68, before starting to cable the storage expansion enclosures to the DS4800.
Protective
cap
10
Plastic
tab
SFP
module
Fibre Channel
cable
Protective
caps
Protective
cap
SFP
module
90
o
Wire
tab
o
Figure 2. Connecting fibre channel to the SFP module
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