Chapter 1: DXi4701 System Description
Supported RAID Configurations
20
Quantum DXi4701 User’s Guide
Supported RAID Configurations
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.
Figure 8 DXi4701 Node RAID
Sets
HDD Slot 0
HDD Slot 3
HDD Slot 6
HDD Slot 9
HDD Slot 1
HDD Slot 4
HDD Slot 7
HDD Slot 10
HDD Slot 2
HDD Slot 5
HDD Slot 8
HDD Slot 11
Summary of Contents for DXi4701
Page 1: ...User s Guide Quantum DXi4701 with DXi 2 3 4 Software 6 68106 01 Rev C...
Page 126: ...Chapter 4 DXi4701 Configuration Wizards Support Wizard 100 Quantum DXi4701 User s Guide...
Page 138: ...Chapter 5 DXi4701 Home Page Current Activity Overview 112 Quantum DXi4701 User s Guide...
Page 384: ...Chapter 9 DXi4701 Configuration Contacts 358 Quantum DXi4701 User s Guide...
Page 418: ...Chapter 10 DXi4701 Utilities Reboot Shutdown 392 Quantum DXi4701 User s Guide...
Page 436: ...Appendix B Troubleshooting Common Problems and Solutions 410 Quantum DXi4701 User s Guide...