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April 27th, 2017 05:00
Fast cache performance
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
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kelleg
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April 28th, 2017 10:00
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