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Chapter 1 RAID Introduction
1.1 What is RAID?
It is inevitable that a single hard disk, either with SCSI or IDE interface, will suffer the compatibility
problem between the motor rotational speed and the transfer interface. As a result, an Ultra160 SCSI or
ATA100 IDE hard disk can only achieve the transfer rate of up to 30MB/Sec at the bandwidth of
100MHz.
In addition, the life span of a hard disk is limited. Once a hard disk is damaged, it is likely to lead to the
system crash and data loss. Above mentioned are two severe problems in network system architecture.
These factors have encouraged the creation of RAID (Redundant Arrays of Inexpensive / Independent
Disks), a technology that combines multiple inexpensive and independent hard disks into an array of
harddisks so as to increase data transfer performance and storage effi ciency.
RAID implements the mechanisms such as Striping or Mirroring plus Parity Checking, to combine two
or more physical hard disks into one virtual/logical disk array that allows On-line, quick access, huge
capacity and fault tolerance. If one of the hard disks in the array is damaged, the system continues to
operate using the remaining working hard disks, resulting in no system crash or data loss. In summary,
RAID technology increases the performance and data security in network system architecture.
1.2 RAID Functions
Expanding storage capacity
Increasing data transfer speed
Saving cost
Inherent Fault Tolerance
Hot Swap
Auto-Rebuild
Hot Spare
On-line Capacity Expansion
1.3 RAID Levels and Comparisons
With the development of RAID technologies, users now have more options for RAID levels. Some
vendors even have proprietary names for RAID levels. Generally, RAID levels include RAID 0, 1, 3, 5, 6,
0+1, 10, 30, 50, 60 and JBOD (Just a Bunch Of Disks).
The following is a comparison of some commonly used RAID levels.
RAID Level
Basic Operation
Method
Hard Disk Available
Capacity
Data Reliability Data Transfer Speed
Minimum Number
of Hard Disks
0
Striping data across
each drive
Total capacity of all
the hard disks
Low Highest 2
1 Mirroring
Half of total capacity
of all the hard disks
High Lower 2
0+1
Mirroring data to
another drive and
stripping across the
drive
Half of total capacity
of all the hard disks
Very High High 4
10 RAID Introduction
- EliteRAID 1
- MobileRAID 1
- Forewords 2
- ER104I Quick Install Guide 3
- MR4I Quick Install Guide 5
- Contents 8
- Chapter 1 RAID Introduction 10
- RAID Introduction 11 11
- 2.1 What is iSCSI? 12
- 2.2 Using iSCSI 12
- 2.3 Glossary 13
- Chapter 3 Installation 14
- 3.2 Management Methods 15
- RAID Introduction 16
- RAID Introduction 17 17
- RAID Introduction 19 19
- RAID Introduction 21 21
- 3.3 System Control 22
- 3.3.1 LCM (SL5650) 22
- 3.3.2 System Buzzer 23
- Chapter 4 GUI Overview 24
- 4.2 Login 25
- 4.3 Quick install 26
- 4.4 System confi g 27
- 4.4.1 System name 27
- 4.4.2 IP address 28
- 4.4.3 Language 28
- 4.4.4 Login Confi g 28
- 4.4.5 Password 29
- 4.4.6 Date 29
- 4.4.7 E-Mail 29
- 4.4.9 System log Server 30
- 4.4.10 Event log 30
- 4.5 iSCSI confi g 31
- 4.5.1 Entity property 31
- 4.5.2 NIC 31
- 4.5.3 Node 32
- 4.5.4 Session 32
- 4.5.5 CHAP account 32
- 4.6 Volume confi g 33
- 4.6.1 Physical disk 33
- RAID Introduction 34
- 4.6.2 Volume group (VG) 35
- 4.6.4 Cache volume (CV) 36
- 4.6.5 Logical unit number 37
- 4.6.6 Example 37
- RAID Introduction 39 39
- RAID Introduction 41 41
- RAID Introduction 43 43
- 4.7 Enclosure Management 45
- 4.7.1 SES confi g 45
- 4.7.2 Hardware Monitor 45
- 4.7.4 UPS 46
- 4.8 Maintenance 47
- 4.8.1 Upgrade 47
- 4.8.2 Info 48
- 4.8.3 Reset to default 48
- 4.8.5 Shutdown 48
- 4.9 Logout 49
- Chapter 5 Advanced Operation 50
- RAID Introduction 51 51
- 5.3 UDV Expansion 52
- 5.4 Disk roaming 52
- 6.1 Sharing Resources 53
- 6.3 Remote Access 54
- Appendix 55
- B. Event notifi cations 57
- • System confi g events 58
- • LVM events 58
- RAID Introduction 59 59
- D. Microsoft iSCSI Initiator 61
- Figure D.3 62
- Figure D.4 62
- Figure D.5 63
- Figure D.6 63
- Figure D.7 64
- Figure D.8 65
- C. Click “Log off” 65
- • Network diagram of MPIO 66
- Figure E.1 66
- RAID Introduction 67 67
- SANS DIGITAL 68
- Figure E.8 69
- Figure E.9 69
- Figure E.10 70
- Figure E.11 70
- Figure E.12 71
- • Log on 71
- • Log on again 73
- Figure E.16 73
- Figure E.17 73
- Figure E.18 74
- Figure E.19 75
- Figure E.20 75
- SANS DIGITAL iSCSI 76
- RAID Introduction 77 77
- • Log on 78
- Figure E.25 78
- • Then click “Advanced” 78
- Figure E.26 78
- Then click “OK” 79
- Figure E.27 79
- Figure E.28 80
- Figure E.29 80
- RAID Introduction 81 81
- Figure F.1 82
- Figure F.2 83
- Figure F.3 83
- • Click “OK” 83
- Figure F.4 83
- Figure F.5 84
- RAID Introduction 85 85
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