Supported Raid Configurations; Figure 8 Dxi4701 Node Raid Sets - Quantum DXi4701 User Manual

Chapter 1: DXi4701 System Description

Supported RAID Configurations

Supported RAID Configurations
Figure 8 DXi4701 Node RAID
Sets
20
RAID is short for Redundant Array of Independent (or Inexpensive) Disks,
which is a category of storage that employs 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, 6 and 10. The DXi4701
uses RAID 6.
RAID 6 Configuration
RAID 6 uses block-level striping with two parity blocks distributed across
all member disks. Dual parity provided by a RAID 6 configuration
ensures that your data retains full integrity even in the event of two
hard drive failures. Since single parity RAID levels are vulnerable to data
loss until the failed drive is rebuilt: the larger the hard drive, the longer
the rebuild will take and the longer the system is vulnerable to possible
data loss.
The DXi4701 Node and Expansion modules (JBODs) use RAID 6 volumes
for data storage (see
• DATA - HDD slots 1–11 (data storage)
• Hot Spare - HDD slot 0
Note: The hot spare drive is initially located in slot 0. If a hard drive is
replaced, the replacement drive becomes the new hot spare.
HDD Slot 0
HDD Slot 1
HDD Slot 2
Figure 8 and Figure 9):
HDD Slot 3 HDD Slot 6
HDD Slot 4 HDD Slot 7
HDD Slot 5 HDD Slot 8
HDD Slot 9
HDD Slot 10
HDD Slot 11
Quantum DXi4701 User's Guide