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FIBRE-to-SAS/SATA RAID SUBSYSTEM
56
User Manual
RAID 5 – Striping with Distributed Parity
A RAID 5 RAID data is striped and
transferred to disks by independent
read/write operations. The data chunks
that are written are also larger than in a
RAID 0. The RAID 5 uses parity that is
striped across all disks in the RAID. You
need at least 3 disks to implement a
RAID 5. A RAID 5 can withstand a single
disk failure without loosing data or
loosing access to the data. The following
illustration shows a typical RAID 5 RAID.
Advantages
Disadvantages Ideal Use
Read data
transactions are very
fast.
Write data transactions
are somewhat slower (due
to the parity that has to
be calculated)
Disk failures have an
effect on throughput,
although this is still
acceptable.
A good all-round sys-
tem that combines
efficient storage with
excellent security
and decent
performance.
Ideal for file and
application servers.
RAID 6 – Striping with Dual Distributed Parity
The RAID subsystem’s RAID 6 function
provides the highest level of data
protection by tolerating multiple
simultaneous drive failures without
downtime or data loss. RAID 6 probability
of data loss is 1/1,000 (three orders of
magnitude) less that of an equivalent
RAID 5 array.
Where RAID 5 writes one parity block for each
stripe across the array, RAID 6 saves two
parity blocks, allowing the RAID controller to
continue operating with two inoperative drives,
without the loss of data or availability. As drive sizes have increased, the time required
to rebuild an inoperative drive’s data has stretched to several hours. During a rebuild,
data on the remaining drives within a RAID 5 array is unprotected. Should a second drive
fail, the rebuild will halt, and the entire RAID data may be lost. Because RAID 6 can
tolerate two simultaneous drive failures, your data remains fully protected during the
rebuild process. RAID set verification may be run ad-hoc or scheduled to test every
sector for proactive error detection. Furthermore, the system constantly monitors drive
health to proactively predict failure, and to automatically copy data to a spare drive
before the drive fails.
- User Manual 1
- Table of Contents 2
- Preface 6
- Before You Begin 7
- Chapter 1 Introduction 9
- 1.2 Enclosure Chassis 11
- 2.1 Controller Module 13
- For PRO-90-5601 SES board: 26
- 2.4 Drive Carrier Module 32
- 2.5 LCD Display Panel 36
- Environmental Status 37
- 2.7 Backup Battery Unit 49
- Chapter 4 RAID Levels 54
- RAID 1 – Mirroring 55
- Chapter 5 proRAID Manager 57
- Miscellaneous 62
- Expanders 63
- Logical Volumes 64
- 5.4 Screen Template 66
- Chapter 6 RAID Management 67
- 6.1.2.1 Read Cache Data 69
- 6.1.2.3 Write Cache Data 69
- 6.1.2.4 Disk Caching 70
- 6.1.3 RAID Profile Usage 71
- 6.1.4.1 Disabled 73
- 6.1.4.2 ASAP 73
- 6.1.4.3 Background 73
- 6.2 Creating a RAID 74
- 6.3 View RAID Set 80
- 6.4 Modify/Delete RAID Set 83
- 6.4.2 Deleting the RAID 85
- 6.4.3 Renaming the RAID 86
- 6.5 Expanding a RAID 87
- 6.6 Rebuilding a RAID 89
- 6.7 Verifying a RAID 90
- 6.8 Sparing Strategy 91
- 6.8.2 Deleting a Hot Spare 93
- 6.8.3 Viewing Hot Spares 94
- 6.9 RAID Ownership 95
- View Logical Volumes 101
- 7.4 Host Mapping 109
- Chapter 8 Monitoring 112
- 8.2 Disks 115
- 8.2.1.1 Disk Status 116
- 8.2.2 Disk Errors 117
- 8.3 Port Statistics 118
- 8.4 Event Log 120
- Chapter 9 Administration 122
- 9.2 Fibre Channel Config 123
- 9.3 Ethernet Configuration 125
- 9.5 SNMP Configuration 129
- 9.6 Change Password 131
- 9.7 Update Firmware 132
- 9.8 Reset Controller 133
- 9.9 Telnet 134
- 9.11 Config Save/Restore 136
- 9.12 Export Status 137
- 9.13 Set Date and Time 138
- 9.14 Setup Wizard 139
- Chapter 10 Troubleshooting 140
- 10.2 Alert Messages 144
- 10.2.2 Warnings 146
- Appendix 149
- For SES2 board PRO-90-5601: 151
- For PRO-90-6601 SES board: 154
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