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Array Basics
DataDirect Networks EF2800 FC RAID Storage System User Guide (V 1.0)
189
The read performance of a RAID 50 array is excellent—better than a
RAID 5 array—along with better data protection. Write performance is
lower than that of a RAID 0 array, because write operations involve
calculating and writing new parity data as well as writing the new user
data.
B.1.7 Volume Sets
A volume set provides the ability to create a host-accessible LUN that
maps to a single disk in the array, similar to JBOD. Volume sets are non
redundant and have a capacity slightly less than the physical disk they
are created from. Volume sets are useful if you have a single disk
available and you do not want to use it as a spare.
For more information on RAID levels, see The RAIDbook: A Source Book
for RAID Technology, published by the RAID Advisory Board (St. Peter,
Minnesota, February, 1996).
B.2 Comparing RAID Levels
Figure 76 illustrates the differences between the different RAID levels.
Figure 76. RAID Levels Comparison
RAID Level
Min. # of
Drives
Description Strengths Weakness
RAID 0 2 Data striping
without
redundancy
Highest performance No data protection —
one drive fails, all data
is lost
RAID 1 2 Disk mirroring Very high
performance and data
protection, Minimal
penalty on write
performance
High redundancy cost
overhead—because
all data is duplicated,
twice the storage
capacity is required
- User Guide 1
- DataDirect Networks 2
- Important Information 4
- STANDARD WARRANTY 4
- What is in this Guide 6
- Who should use this Guide 6
- International Standards 6
- European Regulations 7
- Battery Safety 10
- Laser Safety 10
- Rack System Precautions 10
- ESD Precautions 11
- Electrical Surges 11
- Data Security 12
- Special Tools and Equipment 12
- Table of Contents 14
- Administrator Software 20
- Arrays & Partitions 20
- Instructions 23
- Introduction 24
- 1.1.1 Enclosure Chassis 27
- 1.2 The Plug-in Modules 28
- 1.2.2 Operators Panel 29
- 1.2.3 LRCI/O Module (FC-AL) 30
- Figure 8. I/O Module 31
- (Figure 9): 32
- 1.2.4 Drive Carrier Module 33
- 1.2.5 Dummy Carrier Modules 34
- Getting Started 38
- 2.2.1 Pre-Requisites 40
- 2.2.2 Unpacking the EF2800 41
- (Figure 18) 43
- (Figure 17) 44
- (Figure 19) 44
- 2.3.1 Parts Check List 45
- 2.3.2 Procedure 45
- (Figure 22) 46
- Figure 21. Module Locations 46
- 2.4.1 Parts Check List 47
- 2.4.2 Procedure 47
- (Figure 25) 48
- Figure 24. Module Locations 48
- Drive 15 49
- 2.7.1 Expansion Enclosures 54
- 2.8.1 Grounding Checks 59
- 2.8.2 Powering On 60
- 2.9 Status LED Indicators 61
- 2.9.3 Disk Drives LEDs 63
- Accessing the EF2800 66
- SAM Software 66
- 3.1 SAM System Requirements 67
- Administrator 69
- (Figure 40) 70
- Figure 40. System Menu 70
- 3.3 Accessing SAM 71
- Figure 41. SAM Login Page 72
- 3.3.3 Logging Off SAM 74
- 3.5.1 Setting SAM Passwords 76
- Setting Up the EF2800 80
- 4.1.2 FC Host Port Loop IDs 81
- 4.1.3 FC Host Port Topology 82
- 4.2.1 FC Device Port Loop IDs 83
- 4.3 Restarting the SMs 84
- 4.3.1 Restarting the SMs 85
- 4.3.2 Shutting Down the SMs 86
- 4.3.3 Putting an SM Offline 87
- 4.3.4 Putting an SM Online 87
- 4.3.5 Killing an SM 88
- (Figure 47) 92
- (Figure 48) 94
- (Figure 49) 95
- 5.2 Managing Arrays 97
- 5.2.3 Reconstructing an Array 98
- 5.3 Managing Partitions 101
- 5.3.2 Adding a Partition 103
- 5.3.3 Expanding a Partition 104
- 5.4 Managing Spares 105
- 5.4.1 Enabling Dynamic Spares 106
- 5.4.3 Managing Global Spares 108
- RAID Management 110
- 6.2 Managing Arrays 111
- 6.2.3 Verifying an Array 114
- 6.2.5 Changing an Array Name 116
- 6.2.6 Trusting an Array 116
- 6.2.7 Deleting an Array 118
- 6.3 Managing Partitions 119
- Figure 56. InfoShield Example 121
- 6.3.4.1 Viewing Known WWNs 122
- 6.3.6 Deleting a Partition 127
- Monitoring System Status 128
- 5.2.1 on page page 74 129
- Page Information on the page 130
- 7.2 Displaying the Event Log 131
- (Figure 59) 132
- Other EF2800 138
- Configurations 138
- Other EF2800 Configurations 139
- 8.1.4 Setting Passwords 141
- 8.4 Changing Management LUNs 144
- EF2800 has good 146
- Cache Setting 147
- 8.9 Rescanning All Ports 149
- 8.10 Pausing I/O 149
- 8.13 Updating Software 154
- Managing Disk Drives & 156
- Enclosures 156
- 9.1 Managing Disk Drives 157
- 9.1.6 Blinking a Drive LED 160
- 9.1.8 Testing a Disk Drive 161
- 9.2 Managing Enclosures 162
- 9.2.1 Setting the EMP LUN 162
- Troubleshooting and 164
- Problem Solving 164
- 10.2 LEDs 166
- 10.2.2 Controller I/O Module 168
- 10.3 Audible Alarm 170
- 10.4 Troubleshooting 171
- 10.4.3 Thermal Control 173
- 10.4.4 Thermal Alarm 174
- 10.5.1 Dummy Carrier Modules 175
- 10.5.2 Auto Start Failure 175
- 10.7 Replacing a Module 176
- 10.7.1.1 Removing the Module 177
- 10.7.2 Ops Panel 178
- 10.7.3 Storage Manager Module 179
- 10.7.3.2 Inserting the Module 180
- 10.7.4 Drive Carrier Module 181
- 10.10 Array Problems 184
- 10.11 EF2800 Problems 185
- Administrator) 185
- 10.14.1 Warnings 188
- EF2800 to mark the 189
- EF2800 are 190
- 10.14.2 Errors 192
- 10.15.1 Collecting Debug Logs 193
- Log Files 194
- 10.18.1 Disk Errors 197
- 10.18.2 Disk Channel Errors 198
- Error Code Description 199
- 10.19 Slow Write Performance 200
- Enclosure Specifications 202
- A.1.5 Power Cords 203
- A.1.6 Environment 203
- A.1.7 Interfaces 204
- A.1.10 RAID Card 206
- Array Basics 208
- B.1 Array Types 209
- B.1.3 RAID 3 210
- B.1.4 RAID 4 211
- B.1.5 RAID 5 211
- B.1.6 RAID 50 211
- B.2 Comparing RAID Levels 212
- Capacities 214
- Accessing Disk Array 216
- Font Terminal 217
- Translations None 217
- Columns 80 217
- Setting Value 218
- Figure 78. System Menu 219
- C.2 Via the Ethernet Port 220
- Click Font to set the 221
- Figure 81. System Menu 222
- To Do this 223
- Select Function 223
- Creating and Managing 228
- (Figure 89) 231
- (Figure 92) 233
- (Figure 93) 235
- (Figure 96) 237
- (Figure 97) 239
- D.2 Managing Arrays 241
- D.2.3 Adding a Partition 245
- D.2.4 Verifying an Array 248
- . The system confirms that 250
- D.2.5 Reconstructing an Array 250
- D.2.7 Changing an Array Name 254
- D.2.9 Trusting an Array 255
- D.2.10 Deleting an Array 257
- D.3 Managing Partitions 258
- D.3.3 Expanding a Partition 266
- (Figure 130) 272
- (Figure 135) 277
- D.3.9 Deleting a Partition 280
- >. The system asks 281
- E.2 Displaying the Event Log 283
- Information 289
- Statistics 294
- Managing Spares 298
- F.1 Managing Dedicated Spares 299
- F.2 Enabling Dynamic Spares 301
- F.3 Managing the Spare Pool 303
- Managing Disk Drives and 306
- G.1 Managing Disk Drives 307
- (Figure 149) 308
- G.1.6 Blinking a Drive LED 315
- G.1.7 Taking Down a Drive 315
- G.1.8 Testing a Drive 316
- G.2 Managing Enclosures 317
- Configuring the EF2800 320
- Manager Module 321
- H.1.4 Other Controller Menu 323
- EF2800 over a host 326
- You have two 327
- H.4.1 Viewing LUN Information 329
- (Figure 166) 330
- EF2800 has good airflow 332
- EF2800 requires airflow 332
- EF2800 continue 332
- H.7 Locking the Cache Setting 334
- H.10 Rescanning All Channels 337
- H.11 Pausing I/O 338
- H.13 Updating Firmware 339
- Firmware 340
- H.13.2 Updating LAN Firmware 341
- LAN Configuration 344
- Glossary 352
- See LAN subsystem 371
- Numerics 379
- Product Shipping Instructions 380
- 96-00147-001 381
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