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Tivoli Storage Manager for Windows Backup-Archive Clients Installation and User's Guide
From your local workstation, you can back up one or more volumes as a
single object (image backup) on your system. These volumes can be
formatted FAT, FAT32, NTFS, or unformatted RAW volumes. If a volume is
NTFS-formatted, only those blocks used by the file system will be backed
up.
An image backup provides the following benefits:
- Improves the speed with which Tivoli Storage Manager restores file systems
containing many small files.
- Conserves resources on the server during backups since only one entry is
required for the image.
- Provides a point-in-time picture of your logical volume, which may
be useful if your enterprise needs to recall that information. For
special considerations regarding point-in-time restores, see Backup Image.
- Restores a corrupt file system or raw logical volume. Data is
restored to the same state it was when the last logical volume backup was
performed.
The traditional offline image backup prevents access to the
volume by other system applications during the operation.
For Windows 2000 only: If the Tivoli Storage Manager
Logical Volume Snapshot Agent (LVSA) is installed and configured, Tivoli
Storage Manager performs an online image backup during which the
volume is available to other system applications. The Tivoli Storage
Manager LVSA maintains a consistent image of a volume during online image
backup. To install or configure the Tivoli Storage Manager LVSA:
- Select Setup Wizard > Utilities from the
Tivoli Storage Manager GUI main window. The Client Configuration Wizard
appears.
- Select Help me configure the TSM Logical Volume Snapshot Agent
and click the Next button. The Logical Volume Snapshot Agent
Wizard panel appears.
- Select the task you want to perform. You can install the LVSA,
update the LVSA after upgrading the backup-archive client, or remove the LVSA
from your system.
- Complete each panel in the wizard and click the Next button to
continue. To return to a previous panel, click the Back
button. To display help information for a panel, click the
Help button.
You can use the imagetype option with the backup
image command or the include.image option to specify
whether to perform an offline or online image backup. See Imagetype for more information.
Before you perform an image backup, please consider the following:
- To perform an offline or online image backup you must have
administrative authority on the system.
- For offline image backups only: Ensure that no other
application is using the volume when you run an offline image backup.
The client will lock the volume, so no other applications can use it, to
ensure a consistent image. The volume remains mounted but
unavailable. If the volume is in use when the client attempts to lock
the volume, the backup will fail. If the client cannot lock a volume
because it is in use, you can perform an online image backup.
- You can assign a management class to manage the volume image. If
you do not assign a management class, the default management class is used for
the image. To assign a management class, use the
include.image option. See Include Options for more information. See Chapter 8, Understanding Storage Management Policies for more information
about management classes.
- You can exclude a volume from image backup using the
exclude.image option. See Exclude Options for more information.
- We recommend that you do not include the system drive in an image backup
because the client cannot have an exclusive lock of the system drive during
the restore and the system drive image cannot be restored to the same
location. Image backup does not guarantee consistency of system
objects, such as the Active Directory. System objects can be spread out
across multiple volumes, and should be backed up using the corresponding
backup commands. Because you cannot restore an image backup to the
volume from which the client is currently running from (or any volume for
which an exclusive lock cannot be obtained) we recommend that you install your
client program on the system drive.
- The Windows 2000 client supports SAN-based server-free data movement that
off-loads data movement processing from the client and server processor and
from the LAN during online or offline image backup and
restore operations.
To enable SAN-based server-free support, you must install and configure the
Tivoli Storage Manager Managed System for SAN feature on the client
workstation. See Appendix B, SAN-Based Server-Free Image Backup for more information.
- Online image backup also requires a Version 5.1 Tivoli Storage
Manager server.
You can perform an incremental-by date image backup to back up files that
have changed since your last image backup. The following restrictions
apply:
- The file system can have no previous full incremental backups produced by
the incremental command.
- You can perform the backup only on formatted volumes; not on raw
logical volumes.
- Incremental-by-date image backup does not inactivate files on the
server; therefore, when you restore an image with the
incremental option, files deleted after the original image backup
will be present after the restore.
- If this is the first image backup for the file system, a full image backup
is performed.
Use the backup image and restore image commands to
perform offline or online image backup and restore operations on a single
volume. See Backup Image and Restore Image for more information.
Use the mode option with the backup image command to
perform an incremental-by-date image backup that backs up only new and changed
files after the last full image backup. However, this only backs up
files with a changed date, not files with changed permissions. See Mode for more information.
You must assign a mount point or drive letter for the volume on which you
want to perform an image backup. Tivoli Storage Manager will not back
up a volume without a drive letter or mount point.
To create an offline or online image backup of your file system or raw
logical volume, perform the following steps:
- Click on the Backup button in the Tivoli Storage Manager main
window. The Backup window appears.
- Expand the directory tree and select the objects you want to back
up. To back up a raw logical volume, locate and expand the
RAW directory tree object.
- To perform an offline image backup, select Image
Backup from the drop-down list.
- To perform an online image backup, select Image Snapshot
Backup from the drop-down list.
- To perform an incremental-by-date image backup, select Incremental
Image (date only) from the drop-down list.
- Click Backup. The Backup Task List window
displays the backup processing status. The Backup Report window
displays a detailed status report.
- Running a full incremental backup after running file system backups and
incremental file system backups will invalidate an image that you made.
- To modify specific backup options, click the Options button
located to the right of the Estimate button. The options you
select are effective during the current session only.
- If you want to estimate the amount of time it takes to process your files
and directories, click the Estimate button. The Estimated
Transfer Time field reads N/A if no files are sent to or from the current
server.
The following is an example of how you can use image and incremental
backups together:
| Client
| Server
|
Monday
| Files 1, 2 and 3 reside here.
| An image backup is performed. (Assume a full incremental was also
performed.)
|
Tuesday
| File 4 is created.
| Daily incremental is performed - including incremental for file 4.
|
Wednesday
| File 2 is deleted; file 3 is changed.
| Daily incremental is performed - including incremental for file 3.
|
Thursday
| File 1 is deleted.
| Daily incremental is performed.
|
Suppose you want to use the image created on Monday to restore your
file system as it appeared just after Thursday's incremental backup. You would enter the following command:
dsmc restore image m: -incremental -deletefiles
Tivoli Storage Manager would then use the following process:
- The server sends the image backup to the client. This image
replaces the current content of the target file space. The file system
now contains files 1, 2 and 3. File 4 has been lost because it was not
part of the original image.
- Based on the information from the server about subsequent incremental
backups, the client removes files 1 and 2.
- The client restores file 4.
- The client restores the latest version of file 3.
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