Quantum DXi8500, User Manual

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Chapter 1: DXi8500 System Description
DXi8500 Storage Systems
28 Quantum DXi8500 User’s Guide
Array Modules (3TB
Hard Drives)
Each Array module (RBOD) contains 12 SATA hard drives (3TB each) and
provides a usable capacity of 15TB. Up to two Array modules can exist in
the base rack.
Every module supports RAID 6 with five global hot spares per tray (see
Figure 11 ).
Array modules — RAID set characteristics:
• The first five drives in each Array module (Drives 1 through 5) are
the global hot spares for that enclosure and for Expansion modules
attached to the Array.
• The remaining hard drives in each Array module (Drives 6 through
12) are configured into a RAID 6 set (5 + 2).
Figure 11 Array Module RAID
Sets (3TB Hard Drives)
Expansion Modules
(1TB and 2TB Hard
Drives)
Each Expansion module (EXP-MOD) contains 16 SATA hard drives and
provides a usable capacity of 10TB (with 1TB drives) or 20TB (with 2TB
drives). When using 1TB Array module drives, from 1 to 10 Expansion
modules can be added to an expansion rack. When using 2TB Array
module drives, from 1 to 6 Expansion modules can be added to an
expansion rack. Every Expansion module supports RAID 6 with two hot
spares per tray (see Figure 12 ).
Global Hot Spares
RAID set (5 + 2)
Drive 1
Drive 5
Drive 9
Drive 2
Drive 6
Drive 10
Drive 3
Drive 7
Drive 11
Drive 4
Drive 8
Drive 12