How many ram I need ?

[Mateus Bapista]

@cyberjock

Today I was reading your .ppt "ZFS Storage and other FreeNAS information",
and I have a question about the memory usage by FreeNAS.
The freenas guide said: ".. a general rule of thumb is 1 GB of RAM for every 1 TB of storage."
You said: "So if you have 5TB of storage you’d need 13GB of RAM for FreeNAS, ..."

So I want build a storage with 520TB RAW, how many minimal ram i need ? 520GB or 1352GB?
I want to put all capacity of my mainboard but I just have 24 slots, so is impossible put 1352GB,
and the price of the 64GB memory is inaccessible.

Thanks

 

[danb35]

8 GB base, plus 1 GB RAM / TB of capacity, is the rule of thumb (thus 8 GB base + 5 GB = 13 GB), but it's a very loose rule of thumb. Applying it directly to your system would mean 528 GB of RAM, but at the scale you're talking about, the RAM requirement is going to be heavily driven by the specifics of your use case. You may need a lot more, or a lot less.

 

[SweetAndLow]

Your motherboard has 24 slots for ram? Something isn't adding up here. What is your expected hardware?

@cyberjock

Today I was reading your .ppt "ZFS Storage and other FreeNAS information",
and I have a question about the memory usage by FreeNAS.
The freenas guide said: ".. a general rule of thumb is 1 GB of RAM for every 1 TB of storage."
You said: "So if you have 5TB of storage you’d need 13GB of RAM for FreeNAS, ..."

So I want build a storage with 520TB RAW, how many minimal ram i need ? 520GB or 1352GB?
I want to put all capacity of my mainboard but I just have 24 slots, so is impossible put 1352GB,
and the price of the 64GB memory is inaccessible.

Thanks

 

[Darren Myers]

It's possible he plans to use a board like this http://www.supermicro.com/products/motherboard/Xeon/C600/X9DRE-TF_.cfm as it has 24 DIMM's , min i would want would be x18 32Gb DIMM's as that would give you 576Gb of RAM, since 64Gb DIMM's are out of reach 32's might be your only option. Even if you fully populated all 24 DIMMs with with 8Gb sticks you'd get 192Gb total, and with x24 16Gb DIMMs 384Gb total

 

[Mateus Bapista]

My mainboard is Supermicro X10DRU-i+.
Now I understand the calculation, thanks.

 

[Darren Myers]

My mainboard is Supermicro X10DRU-i+.
Now I understand the calculation, thanks.

That's a pretty funny looking board , let us know how you make out; what kind of server chassis does that board go in?

 

[Mateus Bapista]

Yep, some times motherboards have a proprietary busses, and some projects are "pretty funny" but this is the highend hardware world :p. I will use the barebone SYS-6028U-TR4T+.

You guys can follow my project in this thread: https://forums.freenas.org/index.php?threads/big-project-tips-and-references.35622/

Thanks