Media Refresh - Advanced

Table of Contents

Overview

Media Refresh operation enables you to consolidate data on media. Media refresh might be necessary in the following scenarios:

  • You wish to consolidate data that is spread across several tapes.

    Media attached to storage policy copies with extended retention rules often result in partially-used tapes. For example, consider database backups where the data gets pruned and the transaction logs are retained.

    Consolidating the data on these tapes increases the tape utilization as well.

  • You wish to move the backup contents from an old library to a newer model.

    For example, replace a DLT library with an ULTRIUM library.

  • You wish to replace an old media with a new media, within the same library.

    This may be required if you want to copy the data to a new media due to expiration of media shelf life for compliance purposes.

what Can Be Refreshed what Cannot Be Refreshed
  • Tape Media
  • Disk Media
  • Active Media
  • Deduplication-enabled copies configured for silo storage, where the media refresh settings are applicable to the silo tape storage.

How Does Media Refresh Work

Media Refresh works in conjunction with the Auxiliary Copy feature, as well as your storage policy copies.

When a media is refreshed, the data on the media is consolidated and copied onto a fresh media from the scratch pool. The old media is then refreshed and recycled.

Manually Selecting Media for Refresh

You might use this setting if you wish to refresh some media based on specific requirements while leaving other media undisturbed. You can pick the desired media for refresh and run/schedule a media refresh job at the copy level. Media selected for refresh would be picked up by the media refresh job.

Select Media for Refresh

Before you proceed to select a media for refresh, ensure that the media is full. To mark a media as full, see Mark Media Full.

Use the following steps to manually selecting the media for refresh.

  1. From the CommCell Browser, navigate to Storage Resources | Libraries | <Tape Library> | Media By Location | Media In Library.
  2. In the Media In Library window displayed in the right-pane, select the media for refresh job.
  3. Right-click the <media>, point-to Refresh and then click Pick for Refresh.
  4. In the Pick Media for Refresh Warning dialog box, click Yes.
  5. In the Media For Refresh Response dialog box, for a selected media:
    1. If there are any dependent media, it will be displayed in Dependent Media column.

      Click Yes, Select all dependent media option to pick all media for refresh.

      Click Yes.

      The media is now selected for refresh.

    2. If specific media is not full, in the Reason column, it is displayed as the Media is not Full.

      Click No, Ignore the operation for above media option to ignore and exit the pick media operation.

      Once media is full, perform Mark Media Full operation and then repeat steps 1 - 5 (a).

  6. You can now perform the Media Refresh job.

    See Run Media Refresh.

Unselect Media for Refresh

Use the following steps to prevent or unpick the media for refresh.

  1. From the CommCell Browser, navigate to Storage Resources | Libraries | <Tape Library> | Media By Location | Media In Library.
  2. In the Media In Library window displayed in the right-pane, select the media to unpick for refresh job.
  3. Right-click the <media>, point-to Refresh and then click Unpick and Prevent for Refresh to clear media for refresh.
  4. In the Unpick Media for Refresh Warning dialog box, click Yes to not select the media for refresh.
  5. In the Media For Refresh Response dialog box, for a selected media:

    If there are any dependent media, it will be displayed in Dependent Media column.

    • Select Yes, Select all dependent media option to unpick all medias for refresh.

      Click Yes.

    • Select No, Ignore the operation for above media option to ignore and exit the unpick media operation.
  6. The media is now unselected for refresh.

Viewing Media for Refresh

Before performing the media refresh operation, you can view the media required for the refresh job. If the media required for the job is outside the CommCell, you can recall the media.

Use the following steps to view media qualified for refresh in a Storage Policy/Storage Policy Copy.

  1. From the CommCell Console, navigate to Policies | Storage Policies.
  2. Right-click the desired <Storage_Policy> or <Storage_Policy_Copy>, point to View and then click Media for Refresh.
  3. The Media for Refresh dialog displays the media qualified for refresh for the Storage Policy/Storage Policy Copy.

Mark Active Media Full

Use the following steps to mark media full.

  1. From the CommCell Browser, navigate to Policies | Storage Policies | <Storage_Policy>.
  2. Right-click the Primary copy, point to All Tasks and then click Mark Active Media Full.
  3. Click Yes on the Confirm Mark Active Volumes Full dialog box.
  4. Click OK.

Run Media Refresh

Use the following steps to run the media refresh job.

  1. From the CommCell Console, navigate to Policies | Storage Policies.
  2. Right-click the desired <Storage_Policy>, point to All Tasks and then click Run Media Refresh.
  3. From the Copy Selection area, by default All Copies option is selected to run the job on all copies.

    Select Select A Copy option to run the job on a specific copy and then select storage policy copy from the list.

  4. Select the Start New Media check box, to use a new media for the job.
  5. Select the Mark Media Full On Success check box, to seal the media after the refresh job.
  6. Click the Job Initiation tab.
  7. By default, Immediate option is selected to run the job immediately.
  8. Click OK to run the job now.

Scheduling Media Refresh

Use the following steps to schedule the media refresh job.

  1. From the CommCell Console, navigate to Policies | Storage Policies.
  2. Right-click the desired <Storage_Policy>, point to All Tasks and then click Run Media Refresh.
  3. From the Copy Selection area, select All Copies option to run the job on all copies or select Select A Copy option and then select storage policy copy from the list.
  4. Select the Start New Media check box, to use a new media for the job.
  5. Select the Mark Media Full On Success check box, to seal the media after the refresh job.
  6. Click the Job Initiation tab.
  7. Click Schedule option.
  8. Click the Configure button.
  9. Select the appropriate scheduling options.

    For example, use the following steps to create a weekly schedule:

    1. Type a name for the schedule in the Schedule Name box.
    2. Click Weekly.
    3. In the Start Time box type or select the schedule start time.
    4. Click and select the days to run the schedule.
    5. Click OK.
  10. Click OK.

    The job will be executed as scheduled.

Configure Media Refresh Based on Media Capacity

Use the following steps to refresh media based on the media capacity used.

When the media refresh job is run, media that meets the refresh criteria is picked up for refresh and the data is consolidated and moved to fresh media available in the scratch pool. Note that though the data is moved to new media, the copy configuration remains the same.

  1. From the CommCell Console, navigate to Policies | Storage Policies | <Storage_Policy>.

    Right-click the storage policy copy and then click Properties.

  2. Click the Media tab.
  3. Select Enable Media Refresh check box.
  4. By default, the Media gets refreshed with the below two criteria:

    Months after the media were written - Media that were not written to in the specified number of months will be picked up for refresh.

    Months before the media is aged - Media with specified number of months or more before aging will be picked up for refresh.

  5. Select % or less of media capacity is used check box and type the percentage of media capacity that needs to be used before it is picked up for refresh.
  6. Click OK.

Configure Media Refresh Based on Media Retirement Threshold

Use the following steps to refresh media based on the media expiration threshold parameters.

  1. From the CommCell Console, navigate to Policies | Storage Policies | <Storage_Policy>.

    Right-click the Primary copy and then click Properties.

  2. Click the Media tab.
  3. Select Enable Media Refresh check box.
  4. By default, the Media gets refreshed with the below two criteria:

    Months after the media were written - Media that were not written to in the specified number of months will be picked up for refresh.

    Months before the media is aged - Media with specified number of months or more before aging will be picked up for refresh.

  5. Select media retirement threshold is exceeded check box to refresh media that exceeds the retirement threshold.
  6. Click OK.

    The media will be refresh based on the threshold parameters. See Media Expiration Threshold Parameters for various types of media events for each media.

Recalling Media for Refresh

If you wish to recall media from exported location which is outside the library and bring it back to the library for required operation like restore.

Use the following steps to recall the media for refresh.

  1. From the CommCell Browser, navigate to Storage Resources | <Tape Library> | Media By Location | Media In Library.
  2. In the Media In Library window displayed in the right-pane, select and right-click the <media>, point-to Options and then click Recall Media.
  3. In the Recall Media dialog box, select one of the following options:
    • Infinite: Select this option if you cannot anticipate the length of time the recalled media will need to remain in the source location.
    • Select a Date: Select this option if you are certain of the amount of time the recalled media will need to remain in the source location.
  4. Click the Destination tab.
  5. Select Track Transit check box and then select transit location from the list to track the transit information.
  6. From the Destination area, select Library option and then select library from the list.
  7. Select Acknowledge the action as Reached Destination automatically check box if you wish to acknowledge the recalled media's action as reached destination.
  8. Click OK.

Refreshing Media with a Specified Source MediaAgent

In a shared library configuration, you can select the source MediaAgent to perform the read operation for the refresh job. All configured MediaAgents are displayed as options for the source MediaAgent. Select a MediaAgent that is configured with the storage policy copies. If an invalid MediaAgent is selected, the job might fail.

Use the following steps to refresh media with a specified source mediaagent.

  1. From the CommCell Console, navigate to Policies | Storage Policies.
  2. Right-click the desired <Storage_Policy>, point to All Tasks and then click Run Media Refresh.
  3. From the Copy Selection areas, select All Copies option to run the job on all copies or select Select A Copy option and then select storage policy copy from the list.
  4. If you wish to use a specific MediaAgent for the job, select the Select Source MediaAgent check box, and then select a MediaAgent from the list.

    Note that the storage policy copy must be configured with a shared library and accessible by the selected MediaAgent.

  5. Select the Start New Media check box, to use a new media for the job.
  6. Select the Mark Media Full On Success check box, to seal the media after the refresh job.
  7. Click OK to execute the job as configured.

Refreshing Media Using Deferred Auxiliary Copy

If you wish to refresh the media, and create an additional copy of the data at the same time, then you can use deferred auxiliary copy. The deferred auxiliary copy creates an auxiliary copy at future date (as set), which consolidates the data and creates an additional copy of the backup. This helps to ensure proper maintenance of media, providing extra protection in the event of data loss.

This procedure requires the storage policy's primary and secondary copies to be already created. Refer to the following for additional details regarding the possible Media Refresh scenarios.

To replace media based on its shelf life

Create another secondary copy with the auxiliary copy source pointing to the original storage policy copy, and specify the number of days to defer the auxiliary copy (on the secondary copy).  The number of days to defer the copy is equivalent to the time remaining until the media exceeds its shelf life.

To change the media type

Create another secondary copy with the auxiliary copy source pointing to the original storage policy copy.

To consolidate the media

Specify the number of days to defer the Auxiliary Copy (on the secondary copy).

When refreshing media, if the source of the auxiliary copy is a synchronous copy, the new copy can be a selective or synchronous copy. However, if the source of the auxiliary copy is a selective copy, the new copy must be a selective copy also.

  1. From the CommCell Browser, navigate to Policies | Storage Policies | <Storage_Policy>.
  2. Right-click <storage_policy> for which you want to refresh the media, point to All Tasks and then click Create New Copy.
  3. Specify name in Copy Name box.
  4. Select Library details under Default Destination.
  5. Select Defer Auxiliary Copy for n day(s) box and then type or select the number of days to defer the Auxiliary Copy.

    It is not necessary to complete this task if you are changing the media type.

  6. Click the Copy Policy tab.
  7. In the Specify Source for Auxiliary Copy list box.

     Select the source, which must be the original secondary storage policy copy,

    It is not necessary to complete this task if you are consolidating the media.

  8. Complete configuring the New Copy as you would any other secondary storage policy copy.
  9. Click OK to save your changes.

Related Reports

The following reports provide information on the media refresh job:

Media Prediction Report

The Media Prediction Report specifies whether a media is marked for refresh. The report can also be generated for media that are to be refreshed in a certain number of days.

The following procedure provides the steps necessary to run a Media Prediction Report:

  1. From the CommCell Browser, click Tools -> Reports...
  2. From the Reports pane, select Media Prediction and then click Run.

    The report appears in your default Web browser.

Media Refresh Job Summary Report

The Media Refresh Job Summary Report displays information about all media refresh operations that run in the CommCell.

The following procedure provides the steps necessary to run a Media Refresh Job Summary Report:

  1. From the CommCell Browser, click Tools -> Reports...
  2. From the Reports pane, click Job Summary.
  3. On the General tab, select Administrative Jobs, and then select Media Refreshing.
  4. Click Run.

    The report appears in your default Web browser.

Related Alerts

You can generate a 'Media Refresh' alert e-mail for multiple conditions. Refer to Media Refresh for a list of Available Alerts.

Refer to Alerts and Notifications for comprehensive information on setting up Alerts.