The Tape Consolidation feature provides a way to automatically consolidate tape volumes which contain unused space that is no longer tracked in the Storage Manager database.
Previous releases of StorNext allowed you to consolidate tape space by manually executing the command
fsdefrag (defragment file system), but you can schedule to run automatically at specified times.
- Setting configuration parameters by specifying criteria for determining which tapes are fragmented.
- Creating a schedule to clean old inactive versions of files on tapes.
- Creating a schedule for tape defragmentation.
- On the Tools menu, click Storage Manager, and then click Tape Consolidation. The Tools > Storage Manager > Tape Consolidation page appears.
Enter the following fields:
Tape Full Threshold
Specify the percentage at which tapes become candidates for consolidation. For example, enter 85 if you want tapes flagged for consolidation when they are 85% full.
Specify the percentage of fragmentation at which tapes become candidates for consolidation. For example, enter 15 if you want tapes flagged for consolidation when 15% of the tape becomes fragmented.
Note: This percentage indicates the amount of data written to the tape, not overall tape capacity. For example, suppose a tape has been written to the halfway point. Of that amount, only half the data is still tracked by Storage Manager. Therefore that tape has a fragmentation percentage of 50%, not 25%.
Clean Versions Expiration
Specify the number of Days, Weeks, Months or Years after which you want to clean up versions for deleted or modified files.
Max Active Tape Copy Operations
Specify the number of allowable concurrent active tape copy operations. Fragmented media are defragmented by copying the media to new media. Therefore, each copy operation uses two tape drives.
Max Medcopy Attempts
Specify the maximum number of attempts before StorNext stops trying to copy media experiencing copy failures.
Max Media to Consolidate
Specify the maximum number of tape media which can be consolidated during one
Ignore Vaulted Media
Enter True to ignore tape media in the vault, or False to include media in the vault.
Note: To be candidates for defragmentation, media must pass both the Tape Full Threshold and Fragmentation Threshold percentages. If a media passes only one or the other threshold it will be ignored for consolidation.
- Click Apply to save and apply the parameters you just entered.
- When asked to confirm, click Yes to proceed or No to abort and return to the Tape Consolidation page.
- If you clicked Yes, a message informs you that the Tape Consolidation configuration was updated. Click OK to continue.
- When you are finished configuring Tape Consolidation, click Done to return to the StorNext home page.
The next steps in the Tape Consolidation process are to schedule version cleaning and defragmentation. The process for scheduling these operations is identical to scheduling any other process.
The defragmentation schedule item should normally be scheduled a few hours after the versions cleaning item. The two schedule items work together in managing out-o- date media contents. The clean versions item cleans up the database information for old inactive file segments, and the defragmentation item is used to replace media which have become fragmented due to these segments being cleaned.
Note: There is no default schedule for defragmentation, and the feature is off unless manually scheduled. For more information about scheduling, see Tools > Storage Manager > Scheduler.