HP StoreOnce 4430 HP StoreOnce Backup System Concepts and Configuration Guidel - Page 17

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The figure below shows a single backup job from multiple hosts, where the backup data is radically different from one backup job to the next. There is also only a single stream to the device on the StoreOnce Backup system. This configuration produces slow performance and poor deduplication ratios. Figure 1 Multiplexing produces slow performance and poor dedupe ratios Instead of multiplexing data into a single stream and sending it to the HP StoreOnce Backup system, you should re-specify the multiplexed backup job to be either a single backup job using multiple devices or multiple jobs to separate devices. This will ensure better throughput and deduplication ratios. Finally, multiplexing creates SLOWER restores because data to an individual host has to be de-multiplexed from the data stored on the device. NOT using multiplexing will actually improve restore performance. The next figure shows the recommended configuration where single or multiple jobs are streamed in parallel with little change between backup jobs. There are multiple streams to devices on the HP StoreOnce Backup system, resulting in higher performance and good deduplication ratios. Backup Application considerations 17

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The figure below shows a single backup job from multiple hosts, where the backup data is radically
different from one backup job to the next. There is also only a single stream to the device on the
StoreOnce Backup system. This configuration produces slow performance and poor deduplication
ratios.
Figure 1 Multiplexing produces slow performance and poor dedupe ratios
Instead of multiplexing data into a single stream and sending it to the HP StoreOnce Backup system,
you should re-specify the multiplexed backup job to be either a single backup job using multiple
devices or multiple jobs to separate devices. This will ensure better throughput and deduplication
ratios.
Finally, multiplexing creates SLOWER restores because data to an individual host has to be
de-multiplexed from the data stored on the device. NOT using multiplexing will actually improve
restore performance.
The next figure shows the recommended configuration where single or multiple jobs are streamed
in parallel with little change between backup jobs. There are multiple streams to devices on the
HP StoreOnce Backup system, resulting in higher performance and good deduplication ratios.
Backup Application considerations
17