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Adaptec 4800SAS User Guide - Page 141

RAID 5 Logical Drives, the disk drives with the stored data.

UPC - 760884149355

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Selecting the Best RAID Level ● 141 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 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 next figure) 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 in this figure. Disk Drive 1 250 GB Drive Segment Size (Smallest Disk Drive) Disk Drive 2 250 GB Disk Drive 3 400 GB Disk Drive 4 400 GB Disk Drives in Logical Drive Disk Drive 1 1 4 ... P Disk Drive 2 2 5 ... 748 Disk Drive 3 3 P ... 749 Unused Space = 150 GB Disk Drive 4 P 6 ... 750 Unused Space = 150 GB RAID 5EE = 750 GB plus Parity and Spare Logical Drive

Section	Page
About This Guide	12
How This Guide is Organized	12
What You Need to Know Before You Begin	12
Terminology Used in this Guide	13
Part I: Getting Started	14
Introduction to Adaptec Storage Manager	15
Getting Started Checklist	16
About Adaptec Storage Manager	16
About the Adaptec Storage Manager Agent	16
Growing Your Storage Space with Adaptec Storage Manager	17
A Simple Storage Space	17
An Advanced Storage Space	17
Continuing to Grow Your Storage Space	18
Adding Enhanced Features	19
Unlocking the Enhanced Features	19
System Requirements	20
Installing and Starting Adaptec Storage Manager	21
Installing Adaptec Storage Manager	22
Installing on Windows	22
Completing a Silent Windows Installation (Advanced)	23
Installing on Linux	24
Installing on NetWare	25
Starting Adaptec Storage Manager	26
Starting Adaptec Storage Manager on Windows	26
Starting Adaptec Storage Manager on Linux	27
Starting Adaptec Storage Manager on NetWare	27
Starting the Adaptec Storage Manager Agent Only	27
Starting the Agent on Windows	27
Starting the Agent on Linux	28
Starting the Agent on NetWare	28
Understanding Permission Levels	28
Administrator Level	28
User Level	29
Guest Level	29
Configuring NetWare User Authentication	29
Logging Out of Adaptec Storage Manager	30
Logging Back In	30
Running Adaptec Storage Manager from the CD	31
When to Choose Bootable-CD Mode	31
Getting Started in Bootable-CD Mode	31
Running Adaptec Storage Manager from the CD	32
Exploring Adaptec Storage Manager	33
Navigating the Main Window	34
Using Enterprise View	34
Using Physical Devices View	35
Using Logical Devices View	35
Revealing More Disk Drive Information	36
Checking System Status	37
Working in Adaptec Storage Manager	38
About the Actions Menu	38
Getting Help	38
Building Your Storage Space	39
Selecting a Configuration Method	40
Express Configuration: Building the Easy Way	40
Partitioning and Formatting Your Logical Drives	42
Next Steps	42
Custom Configuration (Advanced)	42
Including More Systems in Your Storage Space	46
Building a RAID Volume	46
RAID Controller Support	48
Managing Your Storage Space	49
Customizing Adaptec Storage Manager	50
Logging In to Remote Systems	51
Removing a Remote System	52
Creating Display Groups	53
Setting Preferences and Changing Views	54
Sorting Systems in the Enterprise View	54
Setting the Standard Unit of Measure	55
Changing the Main Window Appearance	55
Customizing the Adaptec Storage Manager Agent	56
Broadcasting Event Alerts from a System	56
Changing a System’s Event Log Setting	56
Changing a System’s Audible Alarm Settings	57
Changing a System’s Agent Base Port Number	58
Part II: Using Adaptec Storage Manager	59
Managing Logical Drives and Hot Spares	60
Understanding Logical Drives	61
Creating Logical Drives	62
Setting the Size of a Logical Drive	62
Including Different-sized Disk Drives in a Logical Drive	63
Creating a Logical Drive Using Available Space	64
Fine-tuning Logical Drives	65
Changing the Stripe Size	65
Changing the Write Cache Setting	66
Changing the Read Cache Setting	66
Changing the Initialize Priority	66
Changing the Initialize Method	67
Verifying Logical Drives	67
Verifying and Fixing a Logical Drive	68
Verifying a Logical Drive (Without Fix)	69
Enabling/Disabling Background Consistency Check	69
Increasing the Capacity of a Logical Drive	70
Extending a Partition on a Logical Drive	71
Changing the RAID Level of a Logical Drive	72
Deleting a Logical Drive	73
Working with Hot Spares	74
Hot Spare Limitations	74
Dedicated Spare or Global Spare?	74
Designating a Global Hot Spare	74
Assigning a Dedicated Hot Spare	75
What Do the Hot Spare Icons Mean?	76
Removing a Hot Spare	76
Protecting Your Data	77
Creating a Snapshot	78
Snapshot Limitations	78
Creating a Snapshot with Backup	78
Creating a Snapshot Without Backup	78
Deleting a Snapshot	79
Enabling Copyback	79
Monitoring Your Storage Space	80
Monitoring Options	81
Checking Activity in Your Storage Space	81
Viewing the Full List of Events	82
Clearing the Event Log	82
What Do the Status Icons Mean?	82
Using Event Notifications to Monitor Status	83
Setting up Event Notifications	83
Managing the Event Notification List	86
Monitoring and Managing the Notification Log	87
Disabling Event Notifications	88
Setting Up Email Notifications	89
Managing the Email List	92
Monitoring and Managing the Email Log	93
Changing the Email Notification Manager Settings	94
Disabling Email Notifications	95
Broadcasting Event Alerts to Users	95
Silencing and Testing the Audible Alarm	96
Testing the Alarm	96
Silencing the Alarm	97
Disabling a Controller’s Alarm	97
Viewing Component Properties	97
Managing Tasks	98
Scheduling a Task	99
Opening the Task Manager	100
Monitoring Tasks	101
Monitoring Upcoming Tasks in the Task List	101
Checking Past Tasks and Events in the Event Log	101
Modifying a Task	102
What if a task misses its start time?	102
Deleting a Task	103
Disabling the Task Manager	103
Re-enabling the Task Manager	104
Working with Display Groups	105
Adding a System to a Display Group	106
Viewing Display Group Status	106
Removing a System from a Display Group	107
Moving a System from One Display Group to Another	107
Renaming a Display Group	107
Deleting a Display Group	108
Managing Controllers and Disk Drives	109
Rescanning a Controller	110
Registering New Controllers	110
Viewing Controller Properties	111
Saving Your Controller Configuration	111
Updating Controller BIOS and Firmware	112
Before You Begin	112
Updating the Controller BIOS and Firmware	112
Setting a Disk Drive to ‘Failed’	113
Replacing Disk Drives in a Logical Drive	114
Solving Problems	115
Troubleshooting Adaptec Storage Manager	116
Identifying a Failed or Failing Component	116
Recovering from a Disk Drive Failure	116
Failed Disk Drive Protected by a Hot Spare	117
Failed Disk Drive Not Protected by a Hot Spare	117
Failure in Multiple Logical Drives Simultaneously	118
Disk Drive Failure in a RAID 0 Logical Drive	118
Multiple Failures in the Same Logical Drive	118
Removing a Failed Disk Drive’s Icon	118
Rebuilding Logical Drives	119
Solving Notification Problems	119
Creating an Archive File	119
Understanding Error and Warning Messages	120
Warning Messages	120
Error Messages	120
Configuring SNMP Support	126
Configuring SNMP Support on Windows	127
Configuring SNMP Support on Linux	128
Configuring SNMP Support on NetWare	128
Part III: Quick Reference	129
Quick Answers to Common Questions...	130
How do I...?	131
Set up my storage space?	131
Open the Configuration wizard?	131
Turn off the alarm?	131
Add a new user to Adaptec Storage Manager?	131
Add a remote system?	131
Prevent a user from changing my storage space?	131
Check disk drive or logical drive status?	131
Access a feature with a padlock icon beside it?	131
Log out of Adaptec Storage Manager?	131
Schedule a task?	131
Find the Task Manager?	132
Find the Notification Manager?	132
Find the Email Notification Manager?	132
What’s the difference between...?	132
Adaptec Storage Manager and the agent?	132
Event notifications, email notifications, and event alerts?	132
Buttons and Icons At-a-Glance	133
Icons in the Physical Devices View	134
Icons in the Logical Devices View	134
Buttons in the Physical/Logical Devices Views	135
Buttons on the Main Window Tool Bar	135
Selecting the Best RAID Level	136
Comparing RAID Levels	137
Understanding Drive Segments	137
RAID 0 (Non-RAID Logical Drives)	138
RAID 1 Logical Drives	139
RAID 1 Enhanced Logical Drives	139
RAID 10 Logical Drives	140
RAID 5 Logical Drives	141
RAID 5EE Logical Drives	142
RAID 50 Logical Drives	143
RAID 6 Logical Drives	144
RAID 60 Logical Drives	144
Glossary	145