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RAID 5 Logical Drives

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Appendix D: Understanding RAID ● 168 RAID 5 Logical Drives A RAID 5 logical drive is built from a minimum of three and a maximum of sixteen disk drives, and uses data striping and parity (see below) data to provide redundancy. Parity data provides data protection, and striping improves performance. Parity data is an error-correcting redundancy that's used to re-create data if a disk drive fails. In RAID 5 logical drives, parity data (represented by Ps in the example below) is striped evenly across the disk drives with the stored data. Drive segment size is limited to the size of the smallest disk drive in the logical drive. For instance, a logical drive with two 250 GB disk drives and two 400 GB disk drives can contain 750 GB of stored data and 250 GB of parity data, as shown below. Disk Drive 1 250 GB Drive Segment Size (Smallest Disk Drive) Disk Drive 2 250 GB Disk Drive 1 1 4 ... P Disk Drive 3 400 GB Disk Drive 4 400 GB Disk Drives in Logical Drive Disk Drive 2 2 5 ... 748 Disk Drive 3 3 P ... 749 Not Used Unused Space: 150 GB Disk Drive 4 P 6 ... 750 Not Used Unused Space: 150 GB RAID 5 Logical Drive = 750 GB plus Parity In the example above, P represents the distributed parity data.

Section	Page
Contents	7
About This Guide	15
Terminology Used in this Guide	16
Introduction to Adaptec Storage Manager	17
About Adaptec Storage Manager	18
About the Adaptec Storage Manager Agent	18
System Requirements	19
Growing Your Storage Space with Adaptec Storage Manager	20
A Simple Storage Space	20
An Advanced Storage Space	20
Continuing to Grow Your Storage Space	21
Adding Enhanced Features	22
Unlocking the Enhanced Features	23
Getting Started Checklist	24
Step 1: Installing Adaptec Storage Manager	25
Installing on Windows	26
Before You Begin	26
Installing Adaptec Storage Manager	26
Completing a Silent Installation (Advanced)	27
Installing on Linux	29
Before You Begin	29
Installing Adaptec Storage Manager	29
Installing on NetWare	30
Before You Begin	30
Installing Adaptec Storage Manager	30
Step 2: Starting Adaptec Storage Manager	31
Starting Adaptec Storage Manager on Windows	32
Starting Adaptec Storage Manager on Linux	33
Starting Adaptec Storage Manager on NetWare	33
Starting the Adaptec Storage Manager Agent Only	34
Starting the Agent on Windows	34
Starting the Agent on Linux	35
Starting the Agent on NetWare	35
Understanding Permission Levels	36
Administrator Level	36
User Level	37
Guest Level	37
Configuring NetWare User Authentication	38
Logging Out of Adaptec Storage Manager	39
Logging Back In	39
Step 3: Exploring Adaptec Storage Manager	40
Navigating the Main Window	41
Using Enterprise View	41
Using Physical Devices View	42
Using Logical Devices View	43
Revealing More Disk Drive Information	44
Checking System Status	46
Working in Adaptec Storage Manager	47
About the Actions Menu	47
Getting Help	47
Step 4: Building Your Storage Space	48
Selecting a Configuration Method	49
Express Configuration: Building the Easy Way	49
Partitioning and Formatting Your Logical Drives	51
Next Steps	52
Custom Configuration (Advanced)	52
Including More Systems in Your Storage Space	56
Building a RAID Volume	57
RAID Controller Support	60
Managing Your Storage Space	60
Step 5: Customizing Adaptec Storage Manager	61
Logging In to Remote Systems	62
Creating Display Groups	64
Setting Preferences and Changing Views	66
Sorting Systems in the Enterprise View	66
Setting the Standard Unit of Measure	67
Changing the Main Window Appearance	67
Customizing the Adaptec Storage Manager Agent	68
Broadcasting Event Alerts from a System	68
Changing a System’s Audible Alarm Settings	68
Changing a System’s Event Log Setting	70
Changing a System’s Agent Base Port Number	70
Running Adaptec Storage Manager from the CD	71
When to Choose Bootable-CD Mode	72
Bootable-CD Mode Limitations	72
Getting Started in Bootable-CD Mode	72
Running Adaptec Storage Manager from the CD	73
Managing Logical Drives and Hot Spares	74
Understanding Logical Drives	75
Creating Logical Drives	76
Setting the Size of a Logical Drive	76
Including Different-sized Disk Drives in a Logical Drive	77
Creating a Logical Drive Using Available Space	78
Fine-tuning Logical Drives	79
Changing the Write Cache Setting	80
Changing the Stripe Size	80
Changing the Read Cache Setting	81
Changing the Initialize Method	81
Changing the Initialize Priority	82
Verifying Logical Drives	82
Verifying and Fixing a Logical Drive	83
Verifying a Logical Drive (Without Fix)	84
Enabling/Disabling Background Consistency Check	85
Increasing the Capacity of a Logical Drive	85
Extending a Partition on a Logical Drive	88
Changing the RAID Level of a Logical Drive	88
Deleting a Logical Drive	90
Working with Hot Spares	91
Hot Spare Limitations	91
Dedicated Spare or Global Spare?	91
Designating a Global Hot Spare	92
Assigning a Dedicated Hot Spare	93
What Do the Hot Spare Icons Mean?	94
Removing a Hot Spare	94
Protecting Your Data	96
Creating a Snapshot	97
Snapshot Limitations	97
Creating a Snapshot with Backup	98
Creating a Snapshot Without Backup	98
Deleting a Snapshot	98
Enabling Copyback	99
Monitoring Your Storage Space	100
Monitoring Options	101
Checking Activity in Your Storage Space	102
Viewing the Full List of Events	102
Clearing the Event Log	103
What Do the Status Icons Mean?	103
Using Event Notifications to Monitor Status	104
Setting up Event Notifications	104
Managing the Event Notification List	108
Monitoring and Managing the Notification Log	110
Disabling Event Notifications	112
Setting Up Email Notifications	112
Managing the Email List	116
Monitoring and Managing the Email Log	117
Changing the Email Notification Manager Settings	119
Disabling Email Notifications	120
Broadcasting Event Alerts to Users	121
Silencing and Testing the Audible Alarm	122
Testing the Alarm	122
Silencing the Alarm	123
Disabling a Controller’s Alarm	123
Viewing Component Properties	123
Managing Tasks	124
Scheduling a Task	125
Opening the Task Manager	127
Monitoring Tasks	128
Monitoring Upcoming Tasks in the Task List	128
Checking Past Tasks and Events in the Event Log	128
Modifying a Task	130
What if a task misses its start time?	131
Deleting a Task	131
Disabling the Task Manager	132
Re-enabling the Task Manager	132
Managing Remote Systems	133
Introduction	134
Removing a Remote System	134
Working with Display Groups	135
Adding a System to a Display Group	136
Viewing Display Group Status	137
Removing a System from a Display Group	137
Moving a System from One Display Group to Another	138
Renaming a Display Group	138
Deleting a Display Group	139
Managing Controllers and Disk Drives	140
Rescanning a Controller	141
Registering New Controllers	141
Viewing Controller Properties	142
Saving Your Controller Configuration	142
Updating Controller BIOS and Firmware	143
Before You Begin	143
Updating the Controller BIOS and Firmware	143
Setting a Disk Drive to ‘Failed’	145
Replacing Disk Drives in a Logical Drive	146
Solving Problems	147
Identifying a Failed or Failing Component	148
Recovering from a Disk Drive Failure	148
Failed Disk Drive Protected by a Hot Spare	149
Failed Disk Drive Not Protected by a Hot Spare	150
Failure in Multiple Logical Drives Simultaneously	150
Disk Drive Failure in a RAID 0 Logical Drive	150
Multiple Failures in the Same Logical Drive	151
Removing a Failed Disk Drive’s Icon	151
Rebuilding Logical Drives	152
Solving Notification Problems	152
Creating an Archive File	153
Troubleshooting Adaptec Storage Manager	153
Configuring SNMP Support	154
Configuring SNMP Support on Windows	155
Configuring SNMP Support on Linux	156
Configuring SNMP Support on NetWare	156
Quick Answers to Common Questions...	157
How do I...?	158
Set up my storage space?	158
Open the Configuration wizard?	158
Turn off the alarm?	158
Add a new user to Adaptec Storage Manager?	158
Add a remote system?	158
Prevent a user from changing my storage space?	158
Check disk drive or logical drive status?	158
Access a feature with a padlock icon beside it?	158
Log out of Adaptec Storage Manager?	158
Schedule a task?	159
Find the Task Manager?	159
Find the Notification Manager?	159
Find the Email Notification Manager?	159
What’s the difference between...?	160
Adaptec Storage Manager and the agent?	160
Event notifications, email notifications, and event alerts?	160
Buttons and Icons At-a-Glance	161
Icons in the Physical Devices View	162
Icons in the Logical Devices View	162
Buttons in the Physical/Logical Devices Views	163
Buttons on the Main Window Tool Bar	163
Understanding RAID	164
Understanding Drive Segments	165
RAID 0 (Non-RAID Logical Drives)	165
RAID 1 Logical Drives	166
RAID 1 Enhanced Logical Drives	167
RAID 10 Logical Drives	168
RAID 5 Logical Drives	169
RAID 5EE Logical Drives	170
RAID 50 Logical Drives	171
RAID 6 Logical Drives	172
RAID 60 Logical Drives	173
Selecting the Best RAID Level	174
Glossary	175
Index	182