[AsyncAwait]

Like the other commenters here, I can confirm that the FileVault -> APFS transition went smoothly.

[godzillabrennus]

Anyone know how the APFS conversion goes if you have hardware RAID setup?

I’m sporting a Mac Pro mid-2010 and have a RAID-5 array that’ll need to upgrade.

[jasomill]

System Information 10.13 reports a medium type "SSD" for my stock MacPro6,1 flash and medium types "SSD" or "Rotational", as appropriate, for SATA SSDs and hard drives connected via non-RAID Thunderbolt AHCI controllers.

For my two Thunderbolt SAS RAID arrays, however, System Information shows no "Medium Type" field at all. And Disk Utility reports "Solid state: No" for both, even though one is, in fact, all SSD.

Therefore, on this one particular Areca controller at least, I'd be willing to bet that SSD boot volumes would look just like rotational hard drives to APFS and the installer, and therefore would not have been auto-converted at installation time.

With that said, on the GM candidate, converting the volumes on these RAID arrays to APFS after the fact was as simple as right-clicking each in Disk Utility and selecting "Convert to APFS...". And it the week or so since I did so, I've had no problems or regrets.

All volumes on this system are FileVault-encrypted, and APFS conversion did nothing to change this.

[robin_reala]

I’m guessing that’s a spinning rust array? If so it won’t be converted: APFS only gets applied to pure flash setups.

[godzillabrennus]

It’s an all Intel ssd array. Not supported by Apple in any way though. I guess it’ll be skipped.

[AsyncAwait]

Yeah, my sense is that only Apple SSDs and later on Fusion Drives will get converted to APFS.