Review the following table for information about settings, configuration, and performance considerations when using capacity saving.
| Category | Item | Remarks |
|---|---|---|
| Setting | Capacity saving setting | Determine the capacity saving function to use by using the capacity saving rate (%) that is estimated by the Data Reduction Estimation Tool or by guessing at the capacity saving rate (%). |
| Configuration | Capacity of a DSR-VOL | Estimate the number and capacity of the V-VOLs to be provided to the host. If the number of V-VOLs is small, the following performances might not be obtained.
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Number of parity groups |
Determine the number of parity groups when designing the pool capacity. If you consider the number of parity groups, these cases can be considered:
For details, contact customer support. |
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| Cache memory capacity | Determine the cache memory capacity to be installed based on the total used DRS-VOL capacity. For details, contact customer support. |
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| Shared memory capacity | Determine the shared memory capacity to be installed based on the total used DRS-VOL capacity. For details, contact customer support. |
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| Performance | Estimated performance value | Estimate the average write throughput in a customer use case and confirm that garbage data does not keep increasing with the workload. For the average write throughput, estimate the write throughput in the operation cycle (1 day to 1 week, for example). Use the information output by Export Tool 2 for reference. If garbage data increases constantly, the capacity saving function cannot be applied. |