IBM DS8800, Introduction And Planning Manual, Page: 34 / 256

The DS8800 now supports a new high-density and lower-cost large form factor
(LFF) storage enclosure. This enclosure accepts 3.5" drives, offering 12 drive slots.
The previously introduced SFF enclosure offers 24, 2.5" drive slots. The LFF
enclosure has a different appearance from the front than does the SFF enclosure,
with its 12 drives slotting horizontally rather than vertically.
The following notes provide additional information about the labeled components
in the Figure 9:
1. Status indicators for the enclosure
2. 12 LFF drives, 3.5"
Performance features
Features of the expansion storage enclosure include:
v
Support for up to four enclosures per loop
v Redundant, integrated power and cooling
v
6 Gbps SAS data transfer rate to the disk drives
v Support for optical 8 Gbps FC-AL
v
FC-AL to SAS protocol conversion
Power supply and cooling
Power supply features and requirements include:
v The power and cooling system are composed of two redundant power supply
units, accepting 208 V dc voltage.
v Each power supply contains fans to supply cooling for the entire enclosure.
f2c01580
Power Supplies Interface Controller Cards
Back View
Figure 8. Back view of the storage expansion enclosure
1
2
f2c01676
Figure 9. Front view of the LFF storage expansion enclosure
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Introduction and Planning Guide