Mylex AcceleRAID 250 Informations techniques Page 97
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- Table des matières
- MARQUE LIVRES
Noté. / 5. Basé sur avis des utilisateurs
Drive Configuration
Manual No. 775029 2-55
• Build an array (A0) from the three 4.0 GB drives, and build another
array (A1) from the three 2.0 GB drives, with spanning. I will now
have the full 18.0 GB of physical capacity in both A0 and A1 with
which to define logical drives. Therefore, the largest logical drive I
can define would make use of the full 18.0 GB in both arrays.
☛ Note
In the examples above, keep in mind that actual
available “logical” capacity for defining logical drives
will be less than the stated physical capacity when
fault tolerance overhead is considered (in all RAID
levels other than RAID 0 and JBOD).
Spanning Requirements
Specific requirements are necessary if you wish to use spanning:
1. You must enable spanning using the Spanning option on the Custom
Configuration menu before you build disk arrays or define logical
drives on your controller that you intend to span.
2. Spanned disk arrays must have the same number of physical drives in
each array, AND must be defined consecutively. See Table 2-5 for
examples of when spanning is and is not allowed.
Table 2-5. Examples of Spanning and Non-Spanning Situations
Build your disk arrays in Custom Configuration with this in mind!
Array Configuration Spanning Allowed?
A0 only
(any number of drives)
NO. Spanning requires at least two disk arrays.
A0 = 2 drives
A1 = 2 drives
YES. Consecutive arrays have the same number of
physical drives.
A0 = 3 drives
A1 = 2 drives
NO. Spanning requires that consecutive arrays have
the same number of physical drives.
A0 = 2 drives
A1 = 3 drives
A2 = 2 drives
NO. Spanning requires that consecutive arrays have
the same number of physical drives. Spanning is not
allowed between A0 and A2.
A0 = 3 drives
A1 = 3 drives
A2 = 3 drives
YES. Consecutive arrays have the same number of
physical drives. Spanning is allowed across all three
disk arrays.
- RAID EzAssist™ v2.00 1
- Configuration Utility 1
- User Reference Guide 1
- Greetings 4
- Contents 7
- Where to Go Now 10
- First Time? 11
- ❑ Get Started 12
- First-Time Configuration 13
- Manual No. 775029 1-5 13
- Manual No. 775029 1-7 15
- ■ Fault Tolerance? 19
- ■ Spare Drive? 20
- ■ Optimization Priority 21
- ■ Logical Drive Count 23
- ■ Capacity Usage 24
- Manual No. 775029 1-17 25
- Manual No. 775029 1-19 27
- Manual No. 775029 1-23 31
- ■ Define Logical Drives 32
- Manual No. 775029 1-25 33
- Manual No. 775029 1-27 35
- Manual No. 775029 1-29 37
- ❑ Power On Your System 39
- ❑ Start RAID EzAssist 39
- Manual No. 775029 1-33 41
- Manual No. 775029 2-3 45
- Manual No. 775029 2-9 51
- ❑ Fault Tolerance? 53
- ❑ Spare Drive? 54
- ❑ Optimization Priority 55
- ❑ Logical Drive Count 56
- ❑ Capacity Usage 57
- Manual No. 775029 2-17 59
- Manual No. 775029 2-19 61
- Manual No. 775029 2-25 67
- Manual No. 775029 2-27 69
- ❑ Select an Array to Expand 73
- Manual No. 775029 2-33 75
- Manual No. 775029 2-35 77
- Manual No. 775029 2-37 79
- Manual No. 775029 2-39 81
- Manual No. 775029 2-43 85
- Manual No. 775029 2-45 87
- ❑ Assign Spare Drives 89
- Manual No. 775029 2-49 91
- Manual No. 775029 2-51 93
- Manual No. 775029 2-53 95
- When to Use Spanning 96
- Spanning Requirements 97
- Spanning Limitations 98
- Manual No. 775029 2-57 99
- Figure 2-58. Enable Spanning? 100
- ❑ Build Disk Arrays 101
- Caution 102
- Drive Configuration 103
- Manual No. 775029 2-61 103
- ❑ Define Logical Drives 104
- Manual No. 775029 2-63 105
- Manual No. 775029 2-65 107
- How Do I Exit RAID EzAssist? 109
- Controller Configuration 111
- Information? 113
- Controller? 115
- WARNING 117
- Setting 118
- ❑ Enter the Properties Menu 120
- ❑ View/Modify Bus Speed 121
- Manual No. 775029 3-15 125
- Monitoring and 127
- Maintenance Activities 127
- Manual No. 775029 4-3 129
- Manual No. 775029 4-5 131
- Comprise the Array? 132
- Manual No. 775029 4-7 133
- Manual No. 775029 4-9 135
- Write Cache Settings? 137
- ❑ Select a Logical Drive 139
- Figure 4-17. Bad Data Table 140
- Comprise the Logical Drive? 141
- Logical Drive? 143
- ❑ Run a Consistency Check 145
- Manual No. 775029 4-21 147
- Manual No. 775029 4-25 151
- Logical Drive 155
- Manual No. 775029 4-31 157
- ❑ Delete the Logical Drive 158
- Configuration screen 161
- Cache Settings? 162
- Manual No. 775029 4-37 163
- ❑ Select a Physical Device 164
- Manual No. 775029 4-39 165
- Grown, then press Enter 166
- Manual No. 775029 4-43 169
- Manual No. 775029 4-45 171
- (Unused) Status 172
- Manual No. 775029 4-47 173
- Physical Drive? 177
- ❑ Format the Physical Drive 183
- Manual No. 775029 4-61 187
- Manual No. 775029 4-63 189
- Manual No. 775029 4-65 191
- Manual No. 775029 4-67 193
- ❑ Select a Controller 194
- ❑ Rescan the Controller 194
- Manual No. 775029 4-69 195
- Advanced Options 197
- Figure 5-1. Advanced Options 198
- EzAssist Utility? 199
- Figure 5-5. Flash Code Update 200
- Manual No. 775029 5-5 201
- Manual No. 775029 5-7 203
- Manual No. 775029 5-11 207
- ☞ Label the diskette 208
- ❑ Clear the Configuration 210
- Clustering? 211
- Manual No. 775029 5-19 215
- Glossary 217
- Manual No. 775029 G-3 219
- Manual No. 775029 G-5 221
- Disk Array 223
- Disk Drive 223
- Disk Failure Detection 223
- Disk Media Error Management 223
- Disk System 224
- Drive Groups (or Drive Packs) 224
- Drive Traveling 224
- Manual No. 775029 G-9 225
- Fibre Channel 227
- File Server 227
- Flash ROM 227
- Manual No. 775029 G-13 229
- Manual No. 775029 G-15 231
- Manual No. 775029 G-17 233
- Manual No. 775029 G-19 235
- RAID Controller 237
- RAID Levels 237
- Read Ahead Cache 238
- RAID (Level) Migration 238
- Manual No. 775029 G-23 239
- Rotated XOR Redundancy 240
- RS 422/423 240
- SCSI Adapters 241
- SCSI Drive 241
- SCSI Drive States 241
- Segment Size 242
- Manual No. 775029 G-27 243
- Manual No. 775029 G-29 245
- Manual No. 775029 G-31 247
- Wide SCSI 248
- Write Through Cache 248
- Write-Back Cache 248
- CORPORATE OFFICE 250
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