Quantum QXS G2 Series, Руководство по установке и обслуживанию оборудования

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System Overview 29
• Each drawer provides access to 42 slots for Disk Drive in Carrier (DDIC) modules.
• DDICs are top mounted into the drawers.
• The front of the chassis also provides chassis status LEDs and drawer status/activity LEDs.
• At the rear of the chassis, access is provided to rear panel CRUs:
• Two SBB-compliant RAID controllers or expansion IOMs
• Two PSUs
• Five fan cooling modules
5U Chassis Drawers
Each chassis drawer contains 42 slots, each of which can accept a single DDIC containing a 3.5" LFF
drive or a 2.5" SFF drive with an adapter. See Figure 26 on page 23 and Figure 27 on page 24.
Opening a drawer does not interrupt the functioning of the storage system, and DDICs can be
hot-swapped while the chassis is in operation. However, drawers must not be left open for longer
than 2 minutes, or airflow and cooling will be compromised.
IMPORTANT: During normal operation, drawers should be closed to ensure proper airflow and
cooling within the chassis.
A drawer is designed to support its own weight, plus the weight of installed DDICs, when fully
opened.
Safety features
The chassis safety features include:
• To reduce the possibility of toppling, only one drawer can be open at a time.
• The drawer locks into place when fully opened and extended.
• To reduce pinching hazards, two latches must be released before the drawer can be pushed back
into the drawer slot within the chassis.
Power and data are sent via three baseplanes and two sideplanes. The direct-dock SATA version of the
5U chassis has one active and one passive sideplane, and has dual power paths, but only a single data
path.
Locking Drawer
Each drawer can be locked shut by turning both anti-tamper locks clockwise using a screwdriver with
a Torx T20 bit. The anti-tamper locks are symmetrically placed on the left-hand and right-hand sides
of the drawer bezel.
Drawer status and activity LEDs can be monitored via two Drawer LEDs panels located next to the two
drawer-pull pockets located on the left-hand and right-hand side of each drawer. Figure 34 on
page 30 provides the location of the drawer LEDs panel (left and right side.