Deploy Dell PowerFlex v3.6.x

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Calculate required NVDIMM and RAM capacity for FG SDS

Use the following formulas to calculate the necessary capacity for NVDIMM and RAM.

About this task

NOTE: When adding NVDIMM capacity to the SVM, the complete capacity of the NVDIMM must be allocated in a single device when adding to the SVM. For example, 16 GB*2 of NVDIMM will be added as 31 GB (rounded down, since VMware uses some of the capacity for datastore management).

Steps

Calculate the required NVDIMM and RAM capacity using the following table, where X is the total capacity of SDS devices used for the FG storage pool, and Y is the total RAM needed:


FG capacity	Required NVDIMM memory size (GiB)	Required RAM capacity (rounded)	Additional memory for MDM, LIA, and SVM OS	Total RAM (rounded)
49 TB	32 GiB NVDIMM (in SVM it will be 31 GiB)	>36 GiB	MDM: 6.5 GiB LIA: 0.35 GiB OS Base: 1 GiB Buffer: 2 GiB CloudLink 4 GiB	50 GiB
49 TB < `X` < 96 TB	64 GiB NVDIMM (in SVM it will be 62 GiB)	>41 GiB <59 GiB		49 GiB < `Y` < 73 GiB
96 TB < `X` < 128 TB (122.88 is actual limit)	96 GiB NVDIMM (in SVM it will be 93 GiB)	>64.5 GiB <72 GiB		86 GiB

Alternatively, you can calculate NVDIMM capacity and RAM capacity using the following formulas:

NOTE: The calculation is in binary MiB, GiB, and TiB
- NVDIMM_capacity_in_GiB = ((100 * Number_Of_Drives) + (700 * Capacity_in_TiB))/1024
- RAM_capacity_in_GiB = 10 + ((100 * Number_Of_Drives) + (550 * Capacity_in_TiB))/1024