Configuration And Reporting; Handling The Device Out Of Capacity Condition - HP 12000 Design Manual

Configuration and Reporting

Accelerated deduplication is aware of the backup contents of tapes. Therefore, you have reporting
and policy control options available over the deduplication process. You can:
Enable and disable deduplication by backup job type or individual backup job.
Switch from backup to File-level differencing for file server backup jobs.
View deduplication status and statistics per backup job, by backup job type, or by cartridge.
View a detailed breakdown of the capacity used by reference data, deduplicated data, data
awaiting deduplication, and metadata.
The deduplication reports show the following states:
Waiting for Next Backup — the backup has nothing to difference against and is therefore
waiting for a new backup. Incr/diff backups difference against the new full backup, not the old
full backup.
Delta-diff in Process — the backup has identified another version of itself to difference against
and is now running differencing to identify the duplicate data between the two versions. With
multi-stream backups, this process may take multiple tries (going back to "Waiting for Next Backup"
state each time) until the differencing locates the correct stream.
Pending Reclamation — the differencing is complete (duplicate data has been identified) and
space reclamation is now waiting for full cartridges before it can begin.
Partially Reclaimed — in a backup job that spanned multiple cartridges, the full cartridges
have been space reclaimed but the last tape in the spanned set (which is partially full) is waiting
until that tape is full before it can reclaim space.
Dedupe Complete — deduplication, including all space reclamation, is complete for this backup
job.
No Match Found — indicates backups that cannot be deduplicated because they were unable
to match with their previous version due to large-scale modification.
In the detailed Backup and Cartridge reports, the "Dedup Ratio" represents an estimate of the
overall compression ratio (including both deduplication and compression) of that backup/cartridge
based on the amount of logical backup data stored versus the amount of physical disk space used.
If the backup job status is "Waiting for next backup,""Delta-diff in Progress," or "Pending
Reclamation," the ratio will only include the compression because deduplication will not have
actually space reclaimed that tape and therefore will not have saved any disk space. If the status
is "Partially Reclaimed" or "Dedupe Complete," the backup disk space has been partially or fully
reduced by deduplication and the ratio represents compression plus deduplication. The "Physical
Size" value in GB follows the same logic.
Use the System Capacity report to see how much disk space is saved by deduplication. The physical
used space will vary as deduplication creates temporary working data and then eliminates the
duplicate data.

Handling the Device Out of Capacity Condition

In VLS firmware version 3.3.0 and higher, there is a graceful shutdown of backup services in the
VLS when the device reaches 98% full disk capacity. Tthis ensures that there is no loss of data
access when the storage capacity is full. The VLS will reject all attempts to write data from the
backup application at 98% full capacity, so you must reformat/erase unnecessary cartridges via
the backup application to free storage. All read operations will remain unaffected so you can still
restore existing backups on the device or copy backups to tape prior to reformatting them to free
up disk space. Follow the recommended sequence to free up disk space when the device is full:
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