EMC CX500I Configuration Guide - Page 47

A RAID 1/0 Group provides the best combination of performance, and availability

Get EMC CX500I - Insignia CLARiiON NAS Server PDF manuals and user guides View all EMC CX500I manuals
Add to My Manuals
Save this manual to your list of manuals

Page 47 highlights

RAID Types and Trade-offs RAID 5 Group 1st Disk User and Parity Data RAID 3 Group 1st Disk User Data RAID 0 Group (Nonredundant Array) 1st Disk User Data 2nd Disk User and Parity Data 2nd Disk User Data 100% User Data 2nd Disk User Data 3rd Disk User and Parity Data 3rd Disk User Data 80% User Data 20% Parity Data 3rd Disk User Data 4th Disk User and Parity Data 5th Disk User and Parity Data 4th Disk User Data 5th Disk Parity Data Disk Mirror (RAID 1 Mirrored Pair) 1st Disk User Data 2nd Disk User Data 50% User Data 50% Redundant Data 50% User Data 50% Redundant Data RAID 1/0 Group 1st Disk User Data 2nd Disk User Data 3rd Disk User Data 4th Disk User Data 5th Disk User Data Individual Disk Unit User Data 100% User Data Hot Spare Reserved No User Data 6th Disk User Data EMC1820 Figure 2-7 Disk Space Usage in the RAID Configuration A RAID 0 Group (nonredundant individual access array) provides all its disk space for user files, but does not provide any high availability features. For high availability, you can use a RAID 1/0 Group instead. A RAID 1/0 Group provides the best combination of performance and availability, at the highest cost per Gbyte of disk space. An individual unit, like a RAID 0 Group, provides no high-availability features. All its disk space is available for user data, as shown in Figure 2-7 above. RAID Benefits and Trade-offs 2-17

  • 1
  • 2
  • 3
  • 4
  • 5
  • 6
  • 7
  • 8
  • 9
  • 10
  • 11
  • 12
  • 13
  • 14
  • 15
  • 16
  • 17
  • 18
  • 19
  • 20
  • 21
  • 22
  • 23
  • 24
  • 25
  • 26
  • 27
  • 28
  • 29
  • 30
  • 31
  • 32
  • 33
  • 34
  • 35
  • 36
  • 37
  • 38
  • 39
  • 40
  • 41
  • 42
  • 43
  • 44
  • 45
  • 46
  • 47
  • 48
  • 49
  • 50
  • 51
  • 52
  • 53
  • 54
  • 55
  • 56
  • 57
  • 58
  • 59
  • 60
  • 61
  • 62
  • 63
  • 64
  • 65
  • 66
  • 67
  • 68
  • 69
  • 70
  • 71
  • 72
  • 73
  • 74
  • 75
  • 76
  • 77
  • 78
  • 79
  • 80
  • 81
  • 82
  • 83
  • 84
  • 85
  • 86
  • 87
  • 88
  • 89
  • 90
  • 91
  • 92
  • 93
  • 94
  • 95
  • 96
  • 97
  • 98
  • 99
  • 100
  • 101
  • 102
  • 103
  • 104
  • 105
  • 106
  • 107
  • 108
  • 109
  • 110
  • 111
  • 112
  • 113
  • 114
  • 115
  • 116
  • 117
  • 118
  • 119
  • 120
  • 121
  • 122
  • 123
  • 124
  • 125
  • 126
  • 127
  • 128
  • 129
  • 130
  • 131
  • 132
  • 133
  • 134
  • 135
  • 136
  • 137
  • 138
  • 139
  • 140
  • 141
  • 142
RAID Benefits and Trade-offs
2-17
RAID Types and Trade-offs
Figure 2-7
Disk Space Usage in the RAID Configuration
A RAID 0 Group (nonredundant individual access array) provides all
its disk space for user files, but does not provide any high availability
features. For high availability, you can use a RAID 1/0 Group
instead.
A RAID 1/0 Group provides the best combination of performance
and availability, at the highest cost per Gbyte of disk space.
An individual unit, like a RAID 0 Group, provides no
high-availability features. All its disk space is available for user data,
as shown in Figure 2-7 above.
EMC1820
RAID 5 Group
RAID 3 Group
2nd Disk
User and Parity Data
2nd Disk
User Data
3rd Disk
User and Parity Data
3rd Disk
User Data
4th Disk
User and Parity Data
4th Disk
User Data
1st Disk
User and Parity Data
1st Disk
User Data
5th Disk
User and Parity Data
5th Disk
Parity Data
80% User Data
20% Parity Data
RAID 1/0 Group
2nd Disk
User Data
3rd Disk
User Data
4th Disk
User Data
6th Disk
User Data
1st Disk
User Data
5th Disk
User Data
50% User Data
50% Redundant Data
RAID 0 Group
(Nonredundant Array)
2nd Disk
User Data
3rd Disk
User Data
1st Disk
User Data
100% User Data
2nd Disk
User Data
1st Disk
User Data
Disk Mirror (RAID 1 Mirrored Pair)
50% User Data
50% Redundant Data
User Data
Individual Disk Unit
100% User Data
Reserved
Hot Spare
No User Data