From MacInTouch:
A word of caution for those who have a Mac Pro 2013 ("Trash can") with an OWC Aura SSD. There is a known problem where the 10.13 installer will trash both the data partition and the recovery partition, requiring a complete reinstall and restore from backup.
Speaking with OWC, they say that they are working with Apple on the issue. Until then, don't try to install 10.13 until OWC says which dot release of 10.13 is OK - or for those not faint of heart:
1) Make a bootable clone of your Aura SSD that includes a recovery partition.
2) Install the Apple SSD.
3) Boot from recovery partition.
4) Install 10.12.x in the Apple SSD.
5) Boot the Apple SSD.
6) Upgrade to 10.13.
7) Reinstall the Aura.
8) Restore the Aura SSD from the bootable clone.
9) Upgrade to 10.13
Apparently there is a firmware upgrade that 10.13 installed, and it causes the problems if there is a non-Apple SSD present. Once the firmware is upgraded, the installer doesn't cause any problems.
A word of caution for those who have a Mac Pro 2013 ("Trash can") with an OWC Aura SSD. There is a known problem where the 10.13 installer will trash both the data partition and the recovery partition, requiring a complete reinstall and restore from backup.
Speaking with OWC, they say that they are working with Apple on the issue. Until then, don't try to install 10.13 until OWC says which dot release of 10.13 is OK - or for those not faint of heart:
1) Make a bootable clone of your Aura SSD that includes a recovery partition.
2) Install the Apple SSD.
3) Boot from recovery partition.
4) Install 10.12.x in the Apple SSD.
5) Boot the Apple SSD.
6) Upgrade to 10.13.
7) Reinstall the Aura.
8) Restore the Aura SSD from the bootable clone.
9) Upgrade to 10.13
Apparently there is a firmware upgrade that 10.13 installed, and it causes the problems if there is a non-Apple SSD present. Once the firmware is upgraded, the installer doesn't cause any problems.