I’m trying during the installation from MacOS High Sierra to separate the system and user data. I splitted the SSD with Disk Utility, but I can’t mount the second APFS Volume to /Users with the Disk Utility. Is that possible at this stage?


Not with Disk Utility (can't specify custom mount points with Disk Utility) but the macOS installer environment has Terminal. With Terminal, you can run:

mount_apfs /dev/disk1s3 /Users

Replace disk1s3 with the identifier of the volume to mount there.

This should answer your question about mounting during installation, but after a reboot your disk will be unmounted and /Users unavailable. To permanently set a mount point, you'll have to mess with fstab.

  • Thanks a lot @grgarside! I tried it today. I added a volume Users then I went into the terminal mount_apfs /dev/disk1s5 /Users and I got the following error message: /Users: No such file or directory. I tried to create the folder with mkdir Users' but I got this error message: Users: Read-only file system`. – stevo Dec 28 '17 at 0:51
  • @stevo I guess you’re running that from Terminal in recovery/install environment? In that case, you need to specify your disk: /Volumes/Macintosh\ HD/Users instead of /Users for example – grg Dec 28 '17 at 8:28

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