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Hodnocené. / 5. Na základě hodnocení zákazníků
81NAS 2000s Administration Guide
5
Shadow Copies
Overview
The Volume Shadow Copy Service provides an infrastructure for creating point-in-time
snapshots (shadow copies) of volumes. Shadow Copy supports 64 shadow copies per volume.
A shadow copy contains previous versions of the files or folders contained on a volume at a
specific point in time. While the Shadow Copy mechanism is managed at the server (see the
“Managing Shadow Copy” section in this chapter), previous versions of files and folders are
only available over the network from clients and are seen on a per folder or file level and not as
an entire volume.
The Shadow Copy feature works at the block level. As changes are made to the file system, the
Shadow Copy Service copies out the original blocks to a special cache file, to maintain a
consistent view of the file at a particular point in time. Since the snapshot only contains a
subset of the original blocks, the cache file is typically smaller than the original volume. In the
snapshot’s original form, it takes up no space since blocks are not moved until an update to the
disk occurs.
By using shadow copies, a NAS 2000s server can maintain a set of previous versions of all
files on the selected volumes. End users access the file or folder by using a separate client
add-on program, which enables them to view the file in Windows Explorer. Accessing
previous versions of files, or shadow copies, enables users to:
■ Recover files that were accidentally deleted. Previous versions can be opened and copied
to a safe location.
■ Recover from accidentally overwriting a file. A previous version of that file can be
accessed.
■ Compare several versions of a file while working. Use previous versions to compare
changes between two versions of a file.
Shadow copies cannot replace the current backup, archive, or business recovery system, but
they can help to simplify restore procedures. Since a snapshot only contains a portion of the
original data blocks, shadow copies can not protect against data loss due to media failures.
However the strength of snapshots is the ability to instantly recover data from shadow copies,
reducing the number of times needed to restore data from tape.
- NAS 2000s 1
- Part Number: 345650-001 2
- Contents 10
- About This Guide 11
- About this Guide 11
- Overview 12
- Conventions 12
- Text Symbols 13
- Equipment Symbols 13
- Rack Stability 14
- Getting Help 15
- System Overview 17
- Product Redundancy 18
- Product Scalability 18
- Deployment Scenarios 19
- Environment Scenarios 20
- User Interfaces 21
- Menu Tabs 22
- Welcome Screen Contents 22
- NAS 2000s Desktop 23
- NAS Management Console 24
- NIC Team Setup 24
- Figure 3: Maintenance menu 26
- Figure 5: Shutdown menu 27
- Figure 6: Logs menu 28
- Using Remote Desktop 29
- Setting up E-mail Alerts 30
- Figure 8: Network menu 31
- Setup Completion 32
- 10. Restart the system 34
- Fault Tolerance 36
- NIC Teaming Troubleshooting 41
- Managing System Storage 42
- Storage Management Overview 43
- Storage Elements Overview 45
- Logical Drives (LUNs) 47
- Fault-Tolerance Methods 48
- Disadvantages 50
- Advantages 51
- Online Spares 53
- Partitions 53
- Utilizing DM Storage Elements 54
- File System Elements 55
- File-Sharing Elements 55
- Disk Management 57
- Step 1: Create Disk Arrays 59
- Array Configuration Utility 60
- ACU Guidelines 63
- Managing Disks 63
- Disk Management Utility 64
- Disk Management Guidelines 65
- Volumes Page 66
- Managing Volumes 68
- Dynamic Growth 69
- Extending using DiskPart 71
- Scheduling Defragmentation 72
- Disk Quotas 75
- Setting User Quota Entries 76
- DiskPart 78
- Example of using DiskPart 79
- Shadow Copies 81
- Shadow Copy Planning 82
- Allocating Disk Space 83
- Identifying the Storage Area 84
- Mounted Drives 85
- Managing Shadow Copies 86
- The Shadow Copy Cache File 87
- Set Schedules 90
- Disabling Shadow Copies 92
- SMB Shadow Copies 94
- NFS Shadow Copies 95
- Recovery of Files or Folders 96
- Recovering a Folder 100
- Backup and Shadow Copies 100
- User and Group Management 101
- User and Group Name Planning 102
- Managing Local Users 103
- Adding a New User 104
- Deleting a User 104
- Modifying a User Password 105
- Modifying User Properties 105
- Managing Local Groups 106
- Adding a New Group 107
- Deleting a Group 107
- Modifying Group Properties 108
- Folder, Printer, and Share 111
- Management 111
- Creating a New Folder 113
- Deleting a Folder 114
- Modifying Folder Properties 114
- ■ Folder Name 115
- ■ Folder Attributes 115
- 5. Select the user or group 121
- Share Management 124
- Managing Shares 126
- Deleting a Share 127
- Modifying Share Properties 128
- UNIX Sharing 129
- Web Sharing (HTTP) 130
- Protocol Parameter Settings 131
- DFS Protocol Settings 132
- DFS Administration Tool 133
- Setting DFS Sharing Defaults 134
- Creating a Local DFS Root 134
- Deleting a Local DFS Root 135
- Publishing a New Share in DFS 136
- Publish to DFS root 137
- Storage Management 138
- Establishing Directory Quotas 139
- File Screening 140
- Storage Reports 141
- Print Services 142
- Adding an Additional Printer 144
- TCP/IP Print Server service 145
- Microsoft Services for NFS 147
- Logging Events 149
- Directory Domain Controllers 152
- NFS File Shares 154
- Figure 86: UNIX Sharing tab 157
- NFS Only 158
- NFS Async/Sync Settings 159
- NFS Locks 160
- NFS Client Groups 162
- Adding a New Client Group 163
- Deleting a Client Group 163
- NFS User and Group Mappings 165
- Squashed Mappings 166
- General Tab 167
- Simple Mapping Tab 168
- Explicit User Mapping Tab 169
- Explicit Group Mapping Tab 170
- Backing up User Mappings 172
- Restoring User Mappings 172
- Remote Desktop 174
- NetWare File System 175
- Adding Local NetWare Users 178
- Managing NCP Volumes (Shares) 180
- Remote Access Methods and 187
- Monitoring 187
- Web Based User Interface 188
- Integrated Lights-Out Port 188
- Features 189
- Manage Alerts Feature 190
- Telnet Server 191
- HP Insight Manager Version 7 192
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