This table outlines the items to review and plan for before using the capacity saving function.
Classification | Item | Remarks |
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Implementation | Implementation method |
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Capacity | Total used capacity of DRD-VOL | Total used capacity (before capacity saving) of VOL (DRD-VOL) to which the capacity saving function is applied. |
Capacity saving ratio [%] | If the data to which capacity saving is applied already exists, you can run the Data Reduction Estimation Tool. If the data to which capacity saving is applied does not exist, you can estimate the capacity saving ratio by use cases. Contact customer support for the use cases and estimated capacity saving ratio. Capacity saving ratio shown as N:1 can be converted to the capacity saving rate in % by using the following formula: Capacity saving rate [%]=(1-1÷N)×100 |
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Total used capacity of DP-VOL | Total used capacity of DP-VOL to which the capacity saving function is not applied. | |
Configuration | Storage system model | When planning the pool, if you want to implement capacity saving and maintain host performance, you must consider which model is suitable. |
RAID level | Only RAID 6 can be used. | |
Capacity of one DDP group | None. | |
Performance | Requirement for throughput (IOPS) | When planning the pool, if you want to implement capacity saving and maintain host performance, these items must be considered. Average I/O size can be calculated as follows: Average throughput [MB/s] ÷ Average throughput [IOPS] × 1024 |
Read/Write ratio | ||
Average I/O size [KB] | ||
Performance boundary for one DDP group [IOPS] | Calculate the performance boundary for one DDP group by using performance information:
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Other requirement | Use of encryption | You can use both encryption and capacity saving. For details, see VSP One Block Encryption License Key User Guide. |