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Storage Configuration Options
56 Snap Server Administrator Guide
RAID 1 (Mirrored)
RAID 1 uses mirroring, which stores data on one disk drive and copies it to another
drive in the RAID. A RAID 1 must contain at least two disk drives: one for the data
space and one for redundancy. Though the data space in a RAID 1 can never be
larger than a single drive, some administrators prefer to add a third drive (either as
a hot spare or a member) for additional redundancy. RAID 1 is the most secure
method for storing mission-critical data because there is no catastrophic data loss
when a disk fails. However, RAID 1 is the most expensive and least efficient storage
method.
RAID 5 (Striping with Parity)
RAID 5 distributes data evenly among all disks in the array, and maintains parity
information (error correction data) that allows the system to recover from a single
disk drive failure. RAID 5 provides the best combination of performance, usability,
capacity, and data protection.
Hot Spares
A hot spare is a disk drive that can automatically replace a damaged drive in a RAID
1 or 5. If one disk drive in a RAID fails the RAID automatically uses the hot spare to
rebuild itself without administrator intervention.
Volumes
The default configuration organizes the remaining RAID capacity into a single
volume with a single file system. If you need separate file systems on the same
server, you can delete the default volume and create two or more smaller volumes
in its place.
As previously noted, the default RAID capacity is divided between the Snapshot
pool (20%) and the volume (80%). You can increase or decrease Snapshot pool size
at any time; you can increase, but not decrease the size of a volume.
• If a pool reserve of 20% is more than you require, you can decrease the pool size,
then add the freed space to the volume.
• If you find you need to reserve more than 20%, you will have to delete the
volume, expand the pool size, and then create a new volume.
Snapshot Pool Size
The default configuration reserves 20 percent of the volume’s capacity for the
Snapshot pool. You may need to adjust this figure depending on your Snapshot
strategy, write activity, and other factors. For more information, see “Managing the
Snapshot Pool” on page 99.
- Snap Server 1
- Administrator Guide 1
- ETRUST ANTIVIRUS 6
- Contents 7
- Chapter 6 Data Protection 93 10
- Audience 13
- Tips and Cautions 13
- Document Organization 14
- Typographical Conventions 15
- Related Documents 16
- Contacts 17
- Getting Started 19
- Networking 20
- Security 20
- Feature Description Page 21
- Applications 22
- • Discovering Snap Servers — 23
- • Getting Information — 23
- • Setting IP Addresses — 23
- The Administration Tool 24
- Chapter 1 Getting Started 7 25
- Chapter 2 27
- Connecting to the Network 30
- Initial Configuration Tasks 48
- •Server number — 49
- • Serial number — 49
- Registering your Server 53
- Networking Options 55
- Protocol Default Comments 56
- Configuring TCP/IP 57
- • Half-duplex Ethernet — 58
- • Full-duplex Ethernet — 58
- Configuring TCP/IP Settings 59
- to update 60
- Option Settings 60
- Configuring Windows Access 61
- Configuring NFS Access 63
- Configuring a DHCP Server 66
- Connecting from a Client 67
- Web Browser (HTTP) 69
- Storage Configuration and 71
- Management 71
- Storage Configuration Options 73
- Create Snapshot Share 75
- Before You Begin 76
- Using the RAID Storage Wizard 77
- Creating a RAID 78
- Creating a Volume 79
- Creating a Share 80
- Managing and Repairing RAIDs 81
- Determining RAID Set Status 82
- Adding Disk Drives to a RAID 83
- Managing Volume Usage 85
- Disabling Quotas 87
- Tracking Volume Usage 87
- Hot Swapping Disk Drives 88
- Security Management 91
- Default Security Settings 92
- Physically Secure the Server 93
- Configure Users and Groups 94
- Macintosh and FTP Access 95
- • Changing UIDs or GIDs — 96
- Directory 98
- Joining an NIS Domain 101
- Web View Authentication 102
- Secure HTTPS 102
- Caution 106
- How Permissions are Applied 110
- Supported Permissions 110
- Data Protection 111
- Data Backup Options 112
- Backup Express for GuardianOS 113
- PowerQuest DataKeeper 114
- Backup Solutions 115
- Using Snapshots 116
- Recurring Snapshots 117
- Managing the Snapshot Pool 117
- Accessing Snapshots 118
- Snapshot Rollback 121
- Using Backup Express for 122
- GuardianOS 122
- Components 123
- Backup Modes 123
- Restore Modes 124
- Planning Backup Procedures 124
- Backup Schemes 125
- Backing Up Data 126
- Restoring Data 127
- Defaults 128
- Managing the Catalog 130
- The Disaster Recovery Files 132
- Disaster Recovery Procedures 134
- Restoring the Data from Tape 136
- Chassis Failure 137
- Chapter 7 139
- Using Status Screens 142
- Using the Event Log 143
- Local Scanner and Log Views 146
- Using the Local Scanner 147
- The Local Scanner Window 148
- Setting the Scan Options 149
- Setting Selection Options 150
- Setting Display Options 150
- Viewing Directory Paths 151
- About Signature Updates 151
- Setting Schedule Options 152
- Setting Incoming Options 153
- Understanding Alert Options 156
- The Report Tab 156
- Setting Alert Filter Options 157
- Other Local Scanner Options 158
- Using the Move Directory 159
- Using the Log Viewer Window 159
- The Log Viewer List 160
- Troubleshooting 161
- Using Maintenance Modes 162
- Snap Server Specifications 165
- Feature Specification 166
- Taiwan Statement 170
- Appendix B 171
- General Guidelines 173
- • Recover — 178
- • Nsrretrieve — 178
- Upgrading Backup Express for 181
- Jukebox Support 181
- Upgrade Notes 182
- Glossary 183
- Term Definition 184
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