Media Operations

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Overview

Load Media

Export Media

Recall Media

Verify Media

View Contents

Mark Media Full

Move Media

Delete Media

Delete Contents

Prevent Copy

Discover Media

Mark Media Bad

Mark Appendable

Prevent Export

Erase Spare Media

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Overview

The following sections describe the various media related operations that can be performed in a tape/optical library.

The media options vary depending on how the library is configured. The following table provides a list of the media operations in the blind/sighted libraries and stand-alone drives.

Options

Regular Library (with a bar code reader)

Blind Library (without a bar code reader)

Stand-Alone Drive, and Removable Magnetic Disk Storage

PnP (Plug and Play) Disk Libraries

Load Media X X    
Export X X    
Verify Media X X X X
View Contents X X X X
Move X X    
Delete X X X X
Delete Contents X X X X
Erase Media X X    
Discover X X    
Mark Media Bad X X X X
Mark Media Full X X X X
Mark Appendable X X X X
Stamp Media     X X
Erase Media X X X  

Media Block Sizes

MediaAgents can write to media using different block sizes, if the Operating System associated with the MediaAgent in which the library is configured supports a higher block size. The system can write block sizes up to 256 KB and can automatically read block sizes up to 512 KB. If the block sizes are larger than 512 KB, read operations from the media will fail. Also note that such media will be over written and re-used if the When Content Verification Failed option is enabled in the Library Properties (Media) dialog box

Block sizes can be modified from the Data Path Properties dialog box available from the Data Paths tab of the Copy Properties dialog box, for the specific data path. (See Set the Chunk Size and Block Size for a Data Path for step-by-step instructions.)

See Also: Performance Tunables for Media Management

Audit Trail

The following operations are recorded in the Audit Trail, if Audit Trail is enabled:

See Audit Trail for more information.


Load Media

The load media operation loads the media into the drive. You can initiate the load media by right-clicking the media that you wish to load and then choosing the Load Media option.

See Load a Media to a Drive for step-by-step instructions.

Unload Media

You can select the media from the drive and unload it if necessary.


Export Media

Media residing within a library can be exported to physically remove it from the library. For comprehensive information on exporting media, see Export Media.


Recall Media

The Recall Media feature provides the facility to temporarily bring media back from an export location for a specific operation and return the media to the export location when the operation is complete. For comprehensive information on this option, see Recall Media.

See Recall Media using the Resource View for step-by-step instructions.


Verify Media

The verify media operation is a type of inventory which must be initiated by the user. This operation can be used to verify whether the media information displayed in the CommCell Console matches the OML in the media. You can initiate the verify inventory operation by right-clicking the media that you wish to verify and then choosing the Verify Media option.

A verify inventory operation is displayed as a job in the Job Controller window and can be killed if necessary.

The verify inventory operation does not discover new media.

See also, Verify Media for Blind Libraries.


View Contents

You can view the contents of a specific used media. This feature can be used to view a list of data protection operations residing in the media. All the details associated with the data protection operation(s) available in the media are displayed. This includes the following:


Move Media

You can move spare media between the following pools:

The facility to logically reassign media from one scratch pool to another allows you to ensure that critical operations always have the media that they need. You can also select multiple media and move them from one scratch pool to another.

See the following procedures for step-by-step instructions:


Delete Media

The delete media option can be used to delete the media information from the CommCell. Spare and retired media can be deleted to remove them from the scratch pool and Retired Media group. When a media is deleted, the media information is permanently removed from the CommServe database. You can also select multiple media from the scratch pool, and delete them if necessary.

See Delete a Media for step-by-step instructions.


Delete Contents

The delete contents option can be used to delete the contents of a media and move it to a specified scratch pool. This option can be used to make media available to complete an important data protection job when there are no spare media available in the library.

Caution

Extreme caution should be exercised while using this option as once deleted, the contents of the media will not be available for data recovery operations, nor will the system automatically force the next data protection operation to be a full backup.  Therefore, if you do delete the contents of the media, it is recommended that after the operation is complete, you immediately run a full backup for all the subclients associated with the media. To retrieve a list of the subclients associated with the media before deleting the contents, see View the Contents of a Media.

If you have a library configured with mixed drive types, verify and ensure that the media is moved to a drive pool associated with the specific media type.

See Delete the Contents of a Media for step-by-step instructions.

If you have the need to recover data from a media in which the contents has been deleted, see Accessing Aged Data.


Prevent Copy

Prevent Copy option allows you to disable all the existing jobs in the specifed media from being copied.

Allow Copy

Allow Copy option allows you to enable the (previously disabled) copy jobs from the specified media.

Re-Copy

Re-Copy option allows you to select the existing jobs in the specified media for re-copy. When the re-copy option is selected, the existing jobs will be deleted and selected for re-copy. If the source copy is not available for a job, the existing copy will be retained as is. Re-Copy can be done only on media associated with a secondary copy.


Discover Media

The discover media operation is specific to blind libraries. For comprehensive information on this option, see Discovering Media for Blind Libraries.


Mark Media Bad

If you know that an existing spare or used media is bad, you can mark the media as bad. This will automatically moves the spare media to the Retired Media pool. Note however, if the media is a used or Assigned media, the media will be moved to the Retired Media pool only when the data available in the media is pruned.

See Mark a Media Bad for step-by-step instructions.


Mark Media Full

 If for some reason you do not want to use a media for future data protection operation, you can mark the active media full. 

You can also mark all active media as full for a storage policy copy.

See Mark a Media Full for step-by-step instructions.


Mark Appendable

You can mark full and bad media as appendable. When a media is marked as appendable it can be re-used by the MediaAgent if the Use Appendable Media option is enabled in the Media tab of the Library Properties dialog box.

See the following procedures for step-by-step instructions:


Prevent Export

You can prevent a media from being exported from the library. Subsequently, you can enable the media for export if necessary. All general media  operations can be performed on media that are prevented from being exported. For comprehensive information on exporting media, see Export Media.


Erase Spare Media

The erase spare media operation ensures that the data from removable media (tapes and optical platters) are not recoverable once the media is recycled. Only spare, retired and recycled media from tape and optical libraries can be erased. For comprehensive information on erasing media, see Erase Spare Media.