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Chapter 1: System Description
Supported RAID Configurations
Quantum DXi6900 User’s Guide
34
Figure 15:
DXi6900-S Node RAID Sets
1
2
3
4
5
6
7
8
9
10
11
12
13
1 - SDD Slot 0
5 - SDD Slot 4
9 - SDD Slot 8
13 - SDD Slot 12
2 - SDD Slot 1
6 - SDD Slot 5
10 - SDD Slot 9
3 - SDD Slot 2
7 - SDD Slot 6
11 - SDD Slot 10
4 - SDD Slot 3
8 - SDD Slot 7
12 - SDD Slot 11
Dynamic Disk Pool (DDP) Technology
Dynamic Disk Pool (DDP) technology is a new alternative to traditional RAID configuration. DDP distributes
data, parity information, and spare capacity across a pool of drives, providing the following benefits:
l
Faster drive recovery
l
Easier storage expansion
l
Dynamic re-balancing of data across drives
l
Better data availability
The DXi6900 Array modules (RBODs) and Expansion modules (EBODs) use Dynamic Disk Pool
technology for data storage (see
). All hard disk drives in an Array or Expansion
module are configured in a single DDP pool.
The Dynamic Disk Pool does not include a physical hot spare. However, enough disk space is reserved to
provide the equivalent of a hot spare. And similar to RAID 6, a DDP pool can tolerate up to two drive faults.