Quantum DPM5500 User's Guide download pdf (Page 12)

Chapter 1 DPM5500 System Description

Supported RAID Configurations

Quantum DPM5500 User’s Guide 7

RAID Sets 1 The DPM5500 system is divided into RAID sets. The DPM5500 system

can contain up to four RAID sets (two per array controller):

Array Controller 1 (drive sleds 0 through 11) 1

• The first RAID set is made up of the first six drive sleds (drive sleds 0-

4 including the parity drive with drive 5 as a hot spare).

• The second RAID set is made up of the next six drive sleds (drive

sleds 6-11 including the parity drive).

Array Controller 2 (drive sleds 0 through 11) 1

• The third RAID set is made up of the next six drive sleds (drive sleds

0-4 including the parity drive with drive 5 as a hot spare).

• The fourth RAID set is made up of the next six drive sleds (drive

sleds 6-11 including the parity drive).

Each RAID set can sustain a single hard drive failure.

Supported RAID Configurations 1

RAID is short for Redundant Array of Independent (or Inexpensive)

Disks, which is a category of hard disk drives that employ two or more

drives in combination for fault tolerance and performance. There are a

number of RAID levels in use today such as 0, 1, 3, 5, and 10.

The DPM5500 system support RAID 5 with hot spare configurations.

RAID 5 Configuration 1 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

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Quantum DPM5500 User's Guide Page 12