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Chapter 1 DX-Series System Description

Supported RAID Configurations

14 Quantum DX-Series User’s Guide

RAID 5

Configuration

The RAID 5 configuration is the most common RAID level in use today.

RAID 5 minimizes the write bottlenecks of other RAID levels by

distributing parity stripes over a series of hard drives. In doing so it

provides relief to the concentration of write activity on a single drive,

which in turn enhances overall system performance. Instead of allowing

any one drive in the array to assume the risk of a bottleneck, all of the

drives in the array assume write activity responsibilities. The distribution

frees up the concentration on a single drive, improving overall subsystem

throughput.

The RAID 5 parity encoding scheme maintains the system’s ability to

recover any lost data should a single drive fail. This can happen as long as

no parity stripe on an individual drive stores the information of a data

stripe on the same drive. In other words, the parity information for any

data stripe must always be located on a drive other than the one on which

the data resides (see figure 8

Note: The DX-Series storage array is shipped with the following

RAID configuration:

• 1 logical drive configured in RAID 5 (7 data drives + 1

parity drive)

• 1 logical drive configured in RAID 5 (6 data drives + 1

parity drive)

• 1 global hot spare drive

To reconfigure the DX-Series storage array to either remove

the hot spare or add an additional hot spare (total of two hot

spares), contact Quantum customer support (see Customer

Support on page xvii). Reconfiguring the storage array RAID

configuration will cause all previously stored data to be lost.

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Quantum DX30 Guía de usuario Pagina 32