Usage planning requirements for the capacity saving function

The following table outlines the items to review and plan for before using the capacity saving function.

Classification	Item	Remarks
Implementation	Implementation method	New implementation Changing DP-VOL to DRD-VOL Migrating from old model (using a Program Product) Migrating from old model (through a server)
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
	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	RAID 1, RAID 5, or RAID 6 can be used.
	Drive type	Having the same drive type (including rotational speed) in a pool is recommended.
	Capacity of one parity 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. If you account for these items, Performance Monitor output can be used. 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 parity group [IOPS]	Calculate the performance boundary for one parity group by using performance information: Drive type: Consider the drive you plan to use. Read/Write ratio: Consider the throughput requirements. I/O size: Consider the throughput requirements.
Other requirement	Use of encryption	You can use both encryption and accelerated compression with the FMD-HDE drives. For details, see Encryption License Key User Guide.