IBM 4957-J11, Hardware Installation And Maintenance Manual

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Table 2. IBM COS Medium and Large Disk Enclosure variants
Description
of
configuratio
n
PSUs
1
System
fans
2
IOMs
3
IOM fans
2
Disks HS
expanders
12 Gb/s
direct dock
LFF
2 4 1 2 106 4
Enclosure
location of
CRU variant
Rear Rear Rear Top Top Top
1
Redundant PSUs must be compatible modules of the same type (both AC).
2
For adequate cooling, four rear-panel system fans are required, and two IOM fans provide cooling for
the IOMs (accessed via the top panel).
3
Hot-swappable expanders support 12 disk drive slots per disk bay (8 bays total).
Enclosure core product
The Medium and Large Disk Enclosure design concept is described.
The design concept is based on an enclosure subsystem together with a set of plug-in modules. A typical
enclosure system, as supplied, includes the following:
• An enclosure chassis equipped with several boards, including a mid plane, side plane, and base plane
boards, and a cluster of integral enclosure status LED indicators located at the lower left area of the
enclosure front panel, near the left ear.
• Two 2,000W 200–240V AC power supply unit modules.
• Fan module (system): four system fan modules for enclosure cooling.
• Two interface slots, one of which holds an IOM with four mini-SAS hard disk (SFF-8644) ports, and a
serial port. The other slot contains a blank.
• Fan module (controller): two controller channel fan modules for IOM cooling
• Either 53 or 106 LFF disk drive modules
• One removable HS expander per two rows.
• A rail kit for rack mounting.
• A cable management arm (CMA) for managing cables, and enabling in-rack servicing of the enclosure.
Note: Regarding enclosure modules:
• The disk modules are not installed when the enclosure ships. Do not insert disks into the enclosure until
after it has been secured in the rack. See the section, “Populating disk drive slots” on page 12.
• Unless otherwise noted within a passage pertaining to a particular CRU, the replacement procedure
should be completed within three minutes of the removal of a defective module.
• Before rack-mounting enclosures, see the first CAUTION in the “Safe handling” on page 3 section and
the Installing the Disk Enclosure WARNING.
Enclosure front panel
The Disk Enclosure front panel is described.
The following enclosure front panel diagram intentionally omits the lift handles that attach to the
enclosure sides.
Chapter 3. System overview 7