HP0-J64 · Question #74
A customer has these servers in their IT environment. - 1 Exchange server - 6 SQL database servers - 5 file servers - 16 application servers The customer is using an HP StoreOnce Backup System to…
The correct answer is B. 4. Key factors for performance considerations with deduplication: The inline nature of the deduplication process means that there will always be some performance trade-off forthe benefits of increased disk space utilization. With each Virtual Library or NAS Share created there is…
Question
A customer has these servers in their IT environment.
- 1 Exchange server
- 6 SQL database servers
- 5 file servers
- 16 application servers
The customer is using an HP StoreOnce Backup System to back up their data. To achieve the best deduplication ratio/performance compromise, how many virtual libraries should be created?
Options
- A1
- B4
- C5
- D13
How the community answered
(28 responses)- A4% (1)
- B75% (21)
- C7% (2)
- D14% (4)
Explanation
Key factors for performance considerations with deduplication: The inline nature of the deduplication process means that there will always be some performance trade-off forthe benefits of increased disk space utilization. With each Virtual Library or NAS Share created there is an associated dedicated deduplication store. IfGlobaldeduplication across all backups is required, this will only happen if a single virtual library or NASshare is configured and all backups are sent to it. The best deduplication ratio will be achieved by configuring a minimum number of libraries/shares. Bestperformance will be gained by configuring a larger number of libraries/shares and optimising for individualdeduplication store complexity. If servers with lots of similar data are to be backed up, a higher deduplication ratio can be achieved by backingthem all up to the same library/share. If servers contain dissimilar data types, the best deduplication ratio/performance compromise will be achieved by grouping servers with similar data types together into their owndedicated libraries/shares. For example, a requirement to back up a set of exchange servers, SQL database servers, file servers andapplication servers would be best served by creating four virtual libraries or NAS shares; one for each serverset. When restoring data from a deduplicating device it must reconstruct the original un-deduplicated data streamfrom all of the data chunks. This can result in lower performance than that of the Full backup jobs will result in higher deduplication ratios and better restore performance (because only onepiece of media is needed for a full restore). Incremental and differential backups will not deduplicate as well
Topics
Community Discussion
No community discussion yet for this question.