HP StorageWorks 12000 User Manual Download

Page: 96 / 266

Select

View Backups

The screen displays a list of backup jobs meeting the set criteria and includes the following
information:

• State — the state of the backup job (see below)
• Backup Name
• Policy
• Type
• Logical Size — the size of the backup data sent to the VLS (before deduplication and com-

pression)

• Physical Size Estimate — the disk space currently used to store the compressed backup, which

varies over time as deduplication processes the backup and reclaims redundant disk space

• Dedupe Ratio Estimate — the estimated deduplication ratio (based on the Logical Size divided

by Physical Size Estimate)

From the results list, select a backup name to see the backup statistics for that particular job.

The backup information includes a graph depicting the original data size (shown as zero prior
to the deduplication), the deduplicated size, and the unprocessed data. In the

Cartridge Details

select a barcode to see its cartridge report.

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 Dedupe Ratio Estimate represents 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 full reduced by deduplication and
the ratio represents compression plus deduplication. The Dedupe Estimate in GB follows the same
logic. The “Saved” value represents the amount of disk space reclaimed by deduplication (Logical
minus Physical values).

Deduplication