Adaptec 5325301656 Administration Guide - Page 57

RAIDs, Factors in Choosing a RAID Type

Get Adaptec 5325301656 - Snap Server 14000 NAS PDF manuals and user guides
UPC - 753253016563
View all Adaptec 5325301656 manuals
Add to My Manuals
Save this manual to your list of manuals

Page 57 highlights

RAIDs for servers with four or more drives. In cases where multiple expansion arrays are attached to the Snap Server, a combination of a RAID 1 and hot spares may be the optimal configuration for the Snap Server. See the online help for more information. RAIDs RAIDs are created, viewed, edited, and deleted from the Storage > RAID Sets screen of the Administration Tool. Snap Servers with four or more drives ship with all disk drives configured as a RAID 5. Snap Server 110 and 210 ship with the drive(s) configured as a RAID 0. Before changing the default RAID configuration, consider the following information on the Snap Server's RAID implementation. Note Much of the configuration discussion presented here is not applicable to Snap Servers with fewer than four (4) drives. For Snap Server 110 and 210, see the User's Guide for Snap Server 110 and 210 for storage configuration guidelines. Factors in Choosing a RAID Type The type of RAID configuration you choose depends on a number of factors: • The importance of the data • Performance requirements • Drive utilization • The number of available drives For example, in configuring the four disk drives of the 520, the decision whether to include a hot spare in the RAID depends on the value you place on capacity vs. high availability. If capacity is paramount, you would use all drives for storage; if high availability were more important, you would configure one of the drives as a hot spare. The following table summarizes the advantages and disadvantages of each type of RAID. Features Data Loss Risk Write Access Speeds Usable Capacity Disks Required Supports Hot Spares RAID 0 RAID 1 Highest Lowest Fastest Fast Highest Lowest 1 or more 2 or more No Yes RAID 5 Low Medium High 3 or more Yes RAID 6 Lower Slower Medium 4 or more Yes RAID 10 Very Low Faster Low 4 or more Yes Caution To reduce exposure to double-drive disk failures on RAID 5, use no more than eight drives in a single RAID set and group smaller RAID sets together. Chapter 4 Storage Configuration and Expansion 43

  • 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
  • 143
  • 144
  • 145
  • 146
  • 147
  • 148
  • 149
  • 150
  • 151
  • 152
  • 153
  • 154
  • 155
  • 156
  • 157
  • 158
  • 159
  • 160
  • 161
  • 162
  • 163
  • 164
  • 165
  • 166
  • 167
  • 168
  • 169
  • 170
  • 171
  • 172
  • 173
  • 174
  • 175
  • 176
  • 177
  • 178
  • 179
  • 180
  • 181
  • 182
  • 183
  • 184
  • 185
  • 186
  • 187
  • 188
  • 189
  • 190
  • 191
  • 192
  • 193
  • 194
  • 195
  • 196
  • 197
  • 198
  • 199
  • 200
  • 201
  • 202
  • 203
  • 204
  • 205
  • 206
  • 207
  • 208
  • 209
  • 210
  • 211
  • 212
  • 213
  • 214
  • 215
  • 216
  • 217
  • 218
  • 219
  • 220
  • 221
  • 222
  • 223
  • 224
RAIDs
Chapter 4
Storage Configuration and Expansion
43
for servers with four or more drives. In cases where multiple expansion arrays are
attached to the Snap Server, a combination of a RAID 1 and hot spares may be the
optimal configuration for the Snap Server. See the online help for more information.
RAIDs
RAIDs are created, viewed, edited, and deleted from the
Storage > RAID Sets
screen
of the Administration Tool. Snap Servers with four or more drives ship with all disk
drives configured as a RAID 5. Snap Server 110 and 210 ship with the drive(s)
configured as a RAID 0. Before changing the default RAID configuration, consider
the following information on the Snap Server’s RAID implementation.
Note
Much of the configuration discussion presented here is not applicable to Snap
Servers with fewer than four (4) drives. For Snap Server 110 and 210, see the
User’s
Guide for Snap Server 110 and 210
for storage configuration guidelines.
Factors in Choosing a RAID Type
The type of RAID configuration you choose depends on a number of factors:
•
The importance of the data
•
Performance requirements
•
Drive utilization
•
The number of available drives
For example, in configuring the four disk drives of the 520, the decision whether to
include a hot spare in the RAID depends on the value you place on capacity vs. high
availability. If capacity is paramount, you would use all drives for storage; if high
availability were more important, you would configure one of the drives as a hot
spare. The following table summarizes the advantages and disadvantages of each
type of RAID.
Caution
To reduce exposure to double-drive disk failures on RAID 5, use no more
than eight drives in a single RAID set and group smaller RAID sets together.
Features
RAID 0
RAID 1
RAID 5
RAID 6
RAID 10
Data Loss Risk
Highest
Lowest
Low
Lower
Very Low
Write Access Speeds
Fastest
Fast
Medium
Slower
Faster
Usable Capacity
Highest
Lowest
High
Medium
Low
Disks Required
1 or more
2 or more
3 or more
4 or more
4 or more
Supports Hot Spares
No
Yes
Yes
Yes
Yes