Loading...

Media Properties - Overview

Table of Contents

General

The general information about a media, including the barcode, unique ID for the media in the CommCell, the current library, last written library, location in the library (slot number, or if mounted on a drive, the drive number), export location if the media is exported, the previous export location if the media was previously exported, the storage policy and storage policy copy accessing the media, the stream number (of the storage policy) that was used to write to the media and the CommCell ID are displayed.

The general information about a media can be viewed from the General tab of the Media Properties dialog box.

Media Information

The general information about a media, including the recording format, the media type, discovery date and time, whether the media is required for auxiliary Copy, whether the media is appendable or not, export date and time (if exported), and the condition of the media and the data and time on which it was marked as prevent export, if the media was marked as prevent export is displayed.

The media information can be viewed from the Media Info tab of the Media Properties dialog box.

See View the Condition of a Media for instructions.

Media Properties (Unique ID)

The media information about a media, including information about the amount of data stored in the media and the usage information. The usage information is used to compare against the thresholds established for the media.

Information about the specific media can be viewed from tab that displays the unique ID of the media in the Media Properties dialog box.

Status

The media is cycled through the following stages:

  • When new media is imported and discovered in a library, it is assigned to a scratch pool.
  • When a job requires a media, a media is logically reassigned to the Assigned Media pool.
  • Subsequent jobs write data into the media until it is full. At this point, although the media cannot be written to, it remains in the Assigned Media pool, available for restore operations.
  • When all of the data on the media exceeds its retention criteria and is pruned, the system returns the media to a scratch pool for reuse.
  • Occasionally, a job may encounter hardware or software errors while attempting to write to or read from a media. In these cases, the system may mark the affected media as BAD so that the problem can be diagnosed and, if possible, fixed. (For additional information on scratch pools, see Master Drive Pools, Drive Pools and Drives.)

Status information about individual media is provided in the CommCell Console. The table that follows lists the various media status with a brief description of each status:

Status Description
Active or Active The media is available for writing. In other words, when data is sent to the storage policy copy associated with the media group containing this media, the data is written to this media.
Full The MediaAgent can no longer write to this media, either because it contains no free space or because the media has been marked as full, either by the user or by the MediaAgent. The MediaAgent will mark a media full if it is unavailable for a data protection operation. However, the media will remain in the Assigned Media pool as it contains data that is not aged. (See Mark a Media Full for instructions about marking media volumes full.)
Idle or Spare This media belongs to a scratch pool rather than to the Assigned Media pool. New media should have Idle status after they are imported and discovered. The media from which the data has been pruned and the media is available for to be used should also have Idle status.
Read Only The MediaAgent may mark a media as Read Only when an error is encountered while attempting to write to the media. Although data cannot be written to a Read Only media, it will be possible to restore data from the media.
Bad The MediaAgent can no longer read from nor write to this media. Media with Bad status will be moved to the Retired Media pool after it is recycled.
Undiscovered The media that is available in the library but is not discovered by the resource manager is called undiscovered media.
Aged or Retired Media is marked as Retired when the recycled spare media has been marked as Bad or exceeds the preset thresholds defined for the media in Media Expiration Threshold Parameters.
Cleaning Media that is used for cleaning up the residual meta data from the media after the data is pruned.
Foreign Media that are not used by the MediaAgents in your CommCell environment and are from another CommCell or backup software.
  Only spare media can be marked as Overwrite Protected Media. This media contains data that has aged data but still is recoverable.
Appendable An Appendable media typically has room left on it. The MediaAgent can write to this media, if the Mark Media Appendable option and Use Appendable Media for (n) Days option are enabled in the Media tab of Library Properties. (For more information on this option, see Library Properties.)

Media is marked as Appendable in the following situations:

  • When a media is found to be exported by a data protection or Auxiliary Copy job.
  • When a media is stuck in a drive, by a data protection or Auxiliary Copy job.
  • If the number of streams are reduced for a Storage Policy copy.
  • If the Start New Media option is enabled for a backup from the Advanced Backup Options dialog box.
  • If the Start New Media option is enabled for an auxiliary copy job from the Auxiliary Copy dialog box.
  • Marked as full by the job to perform a LAN free data protection operation.
  • If an alternate data path is used in a Storage Policy Copy.
  • Marked as full by the user.
  • Marked as Full to create a Synthetic Full.