Fast cache performance

Question

Hi everybody we have a vnx 8000.we are working on sizing.now we have some SAS and NL-SAS disks.we want to use fast cache, too. I calculate SAS and NL-SAS effective IOPS.but I couldn't find any calculator for FAST cache IOPS.Is it the same as SAS and NLS SAS Formula? 1-I want to know how much percentage of IOPS will increase with the help of FAST Cache? 2-Is there any calculator for fast cache IOPS? 3-How much Fast Cache Capacity should I consider? 4-How much IOPS will handle by SP Cache which is 128GB for vnx 8000 per sp? thanks

kelleg · Answer

Please see the following KB:

https://support.emc.com/kb/442856 VNX: FAST Cache configuration best practices (User Correctable)

https://support.emc.com/kb/459141 CLARiiON and VNX: Where do I find information about FAST Cache?

A general rule of thumb that we use is 25:1 - 1 EFD for every 25 spinning disks - this is just a general guideline to get started - you may need more or less depending on you needs.

glen

VNX

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