The IBM COS Medium and Large Disk Enclosures
support a 4U (rack space) chassis – see the two figures below. The large Disk Enclosures holds up to
106 low profile (1-inch high) 3.5 inch form factor disk drive modules in a vertical orientation and
the medium Disk Enclosure holds 53 disks in the same orientation. Alternatively, disk slots can hold
a low profile (5/8-inch high) 2.5 inch form factor disk with an adapter within the large form factor
carrier.
Each individual disk drive is hot pluggable and replaceable on site. Drive modules must be
installed during system setup.
Note: Throughout this guide, and in the management interface documents used with this guide, I/O
module (IOM) is a general term denoting a controller module.
The enclosure configurations, including chassis and CRUs, are described on the following pages.
See the Enclosure variants
section for details about various enclosure options.Figure 1. IBM COS Medium and Large Disk Enclosure -
dimetric front orientation
figFigure 2. IBM COS Medium and Large Disk Enclosure -
dimetric rear orientation
