Quantum QXS G2 Series, Руководство по установке и обслуживанию оборудования

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System Overview 53
Populating Drawers with DDICs
The 5U84 chassis does not ship with DDICs installed. Please review these rules:
• The minimum number of drives supported by the chassis is 14.
• DDICs must be added to drive slots in rows (14 drives at a time).
• Beginning at the front of the drawer(s), install DDICs consecutively by number, and alternately
between the top drawer and the bottom drawer.
• Namely, install first at slots 0 through 13 in the top drawer, and then 42 through 55 in the
bottom drawer.
• After that, install slots 14 through 27, and so on.
• The number of populated rows must not differ by more than one row between the top and
bottom drawers.
• Hard disk drives (HDD) and solid state drives (SDD) can be mixed in the same drawer.
• HDDs installed in the same row should have the same rotational speed.
• Although DDICs holding 3.5" disks can be intermixed with DDICs holding 2.5" disks within the
chassis, each row should be populated with drives of the same form factor (all LFF or all SFF).
NOTE: For additional information, see Populating 5U84 Drawers on page 195 within 5U84 Chassis
CRU Replacement on page 190.
Figure 57 shows a 5U84 chassis drawer fully populated with DDICs (42 drives).
Figure 57
5U84 Chassis Drawer Fully Populated (42 Drives)
Chassis Management
Controller modules actively manage the chassis. Each controller has a SAS expander with its own
storage enclosure processor (SEP) that provides a SES target for a host to interface to through the
ANSI SES Standard. If one of these controllers fails, the other module will continue to operate.
Refer to the controller’s specification or the SES Interface specification for definitions of the module’s
functions and its SES control.