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I have 2 SSDs 160GB each and a 4TB Disk (all SATA) I was thinking to put them in Fusion Drive setup, will it work? how it will work?

which setup is recommended if possible? any speed benefits?

  • Fusion Drive (SSD + SSD + HDD)
  • Fusion Drive ((RAID 0 2xSSD) + HDD)

I know the risk of data loss if one of them fail I have the fourth disk will be used for TimeMachine + plus other backup options

  • You might benefit from RAIDing the SSDs - would double the effective bus speed, which is only 3gigabit on the old cheese graters... but I'm not sure it will boot from a DIY RAID without a dedicated RAID card. I wouldn't bother with Fusion if you already have 320GB of SSD. Fusion is designed to be a kind of caching mechanism & has really been out-dated by new large SSDs. – Tetsujin Aug 7 '18 at 9:30
  • I will be testing the raid, my idea was to have a big disk (Fusion Drive) so I can work on photos and other big files, the unused files from the OS will be moved to HDD ... that my understanding on how Fusion Drive :) – Data-Base Aug 7 '18 at 9:53
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    My understanding is everything lives on the HD, with commonly-used files being 'promoted' to the SSD rather than the other way round with them being 'demoted' to the HD. I also get the feeling you will either be able to achieve the 2SSD RAID or the fusion [1 SSD, 1 HD] but no combination that will give you 2 SSDs or the RAID as part of a Fusion. I have the same machine. I just went for a 1TB SSD & 4 4TB HDs, kept it simple ;) – Tetsujin Aug 7 '18 at 9:57
  • Im not trying to invest in this machine as I have plans to buy new one, it lacks Thunderbolt, More ram, better GFX, USB3 ... etc ... thinking on getting a whole new machine next year, but I have this disks and I was thinking to use them – Data-Base Aug 7 '18 at 10:07
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    Sure - i topped mine out a couple of years ago, dual 3.46GHz 6-cores, 64GB RAM, HD 7950 & the big SSD. I haven't needed USB3 [for which I think you can get a PCI card] or Thunderbolt as yet. I'm waiting to see what the hoped-for new Mac Pro looks like next year before I make any decisions. – Tetsujin Aug 7 '18 at 10:17

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