IBM DCS3860, Installation, User'S, And Maintenance Manual

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Fan assemblies
The storage expansion enclosure has two removable fan assemblies. Each fan
assembly contains two fans. The fan assemblies draw air through the enclosure
from front to back across the drives. The fans provide redundant cooling, which
means that if one of the fans fails, the remaining fan assembly continues to provide
sufficient cooling to operate the storage expansion enclosure. The fan operates at
maximum speed under the following conditions:
v
During the first few minutes after power is applied to the DCS3860 enclosure
v
When one of the disk drawers is pulled out or not in the closed/latched position
v
When one of the fan assemblies fails or is removed from the enclosure
Note: To preserve optimal airflow, do not remove a failed fan assembly FRU from
the chassis until you are ready to replace it with a new FRU.
Figure 9 on page 15 shows the location of the fan assemblies. See “Fan assembly
LEDs” on page 64 for information about the fan assembly status LEDs.
Note: Although both fan assemblies (left and right) are identical, they are seated in
the enclosure in opposite directions. If the fan assembly cannot be fully inserted in
the fan assembly bay, rotate it 180 degrees and reinsert it. There are notches on the
top and bottom of the fan assembly bay. Ensure that the slits on the top and
bottom of the fan assembly align with these two notches before the fan assembly is
fully inserted in the fan bay.
dcsi0056
AC DC
2
1
I
O
AC DC
2
1
I
O
Power connector Power supply A Power switch LEDs
Power supply B
Figure 8. Power supply components
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IBM System Storage DCS3860 Storage System: Installation, User's, and Maintenance Guide