Important: The installation order within each drive drawer is from left to right in rows. Slots 1, 4, 7 and
10 must have a drive installed in these locations to make sure there is sufficient air flow to
the drives (see Figure 3). To verify these slots, consult the overlay on the front of each of the
five drive drawers. Make sure the four drives in each row are adjacent to each other. The long
edge of each drive should touch the drive next to it. To maintain a uniform airflow across all
drive drawers, the storage expansion enclosure must be configured with a minimum of 20
drives, with four drives in the front row of each of the five drive drawers.
Disk Drive Modules (DDMs)
The DSC3700 supports up to 60 DDMs in five drive drawers that are accessible from the front of the
storage expansion enclosure. The disk drawer planar board supports 6 Gbps SAS (Serial Attached SCSI)
and Near-Line SAS drives.
Attention: The DSC3700 DDM and the EXP5060 SATA DDM are not compatible. Do not use the
DSC3700 DDMs in an EXP5060 storage expansion enclosures. Similarly, do not use the EXP5060 SATA
DDM in an DSC3700 enclosure
There are no servicable parts in a DDM FRU. If it fails, it must be replaced in its entirety. When replacing
a DDM FRU, be sure to order and install the correct DDM FRU.
Drive
drawers
1
2
3
4
5
dcsq0004
!
Figure 2. DCS3700 hot-swap drive drawers
Front-row
drives
Figure 3. DCS3700 drive drawer
8 IBM System Storage DCS3700: Installation, User, and Maintenance Guide
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