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I am thinking to build a 10TB NAS - Need help!

Hi I am thinking to build my first DIY NAS capable to do the stuffs below. I am thinking to run FreeNas. I have picked the parts in pc part picker. Regarding to the ECC ram, is it necessary for this kind of system? It will be great to hear feedback from others! Thanks in advance 🙂



  • Minimum 10TB of storage 
  • Capable to host 2 Linux VMs (Running docker in VMs)
  • 10GB NIC - high speed transfer
  • 32GB RAM (ECC or non-ECC??)
  • Compact form factor - (I opt for mini-itx form factor)
  • Low power consumption ( My UPS has a low power rating)


  1. Is ECC unbuffered memory a must for a NAS?
  2. Gold rated PSU is it good enough for this kind of application?



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ECC memory in a FreeNAS/TrueNAS CORE system is not a requirement, but it's nice to have in situations where the data is very important. I personally don't use it - my NAS is a Dell OptiPlex 755 from 2008, and it's been going fine on a mismatched set of DDR2 modules for several years now, and I've yet to lose any data. 

York (NAS/Secondary Desktop): Intel Core i7-2600 (4C/8T), 24GB 1333MHz DDR3, Zotac GTX 550 Ti AMP! 1GB, HP OEM GTX 680 2GB, 500GB Crucial MX500, 2x 3TB HDD + 3x 2TB HDD (12TB total), Windows Server 2019


Phobos (Main Desktop): AMD Ryzen 7 2700 (8C/16T), 16GB 3000MHz DDR4, XFX Radeon RX 570 4GB, 1TB WD Blue SN550, 960GB Crucial M500, 2TB Seagate BarraCuda, Windows 10 Pro for Workstations


Bondi: Apple iMac G3 (Tray Loader, Revision A), PowerPC 750, 384MB PC-66, ATI Rage IIc 2MB, 4GB Quantum Fireball, Mac OS 9.2.2


Clover (NAS): Dell OptiPlex 755 MT, Intel Core 2 Duo E8500 (2C/2T), 8GB 800MHz DDR2, 160GB WD Caviar SE (Boot), 2x 1TB WD Caviar Blue (Storage), FreeNAS 11.3-U1

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Generally RAM performance is not the top priority in a NAS, so the extra safety of ECC is good.


Gold rated is generally more than enough, assuming the PSU is decent.  

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Exactly as others said, not required, but I chose to use it… I spent close to 2 grand on all the hardware including 10x4 TB drives, what’s an extra ~100 bucks in RAM to get ECC.


Also, if you want to run VM’s, I would look at virtualizing freenas as running things under freenas is not ideal. I use ESXi and run a few Ubuntu server VM’s alongside Freenas, and a windows VM as well. I used to try and run things under freenas, but that was just a headache. 

Rig: i7 10700k @ 5.1Ghz, 4.8 Ring - - Z490 Vision G - - EVGA RTX 2080 XC Ultra @ 2025Mhz - - 4x8GB Vengeance Pro 3000Mhz 15-17-17-34 @ 3500MHz 16-19-19-38 - - Samsung 950 Pro 512 NVMe Boot + Main Programs - - Samsung 830 Pro 256 RAID 0 Lightroom + Photo work - - WD Blue 1 TB SSD for Games - - Corsair RM850x - - Sound BlasterX EA-5 - - EK Supremacy Evo - - XT45 X-Flow 420 + UT60 280 rads - - EK Full Cover GPU Block - - EK XRES RGB PWM - - Fractal Define S2 - - Acer Predator X34 -- Logitech G502 - - Logitech G710+ - - Logitech Z5500 - - Steel Series QcK XXL


Headphones/amp/dac: Schiit Lyr 3 - - Fostex TR-X00 - - Sennheiser HD 6xx


Homelab/ Media Server: ESXi 6.5 - - 250 GB SSD for VM's/ESXi boot - - FreeNAS - - HPE Proliant ML10 Gen 9 backbone - - i3 6100 - - 28 GB ECC - - 10x4 TB WD Red RAID Z2 - - 10TB WD Red for expendable data - - Corsair 750D - - Corsair RM650i - - Dell H310 6Gbps SAS HBA - - Intel RES2SC240 SAS Expander


White Lightning (original full watercooled build) - Homelab / Media Server - The Blue Beast (my car and other expensive hobby...) - iPhone Xs - 2018 MacBook Air

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why exactly do you want to run docker in a VM when you could choose a NAS OS that can run docker natively.

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