I'm running Vmware ESXi 6.5 on an Xserve 3.1 and due to the power saving settings it puts the internal drives to sleep a short while after boot which prevents ESXi from saving settings.
I've tried booting into OSX and disabling there but the problem persists in ESXi. I've also tried the usual SMC and NVRAM resets.
The symptom is a 'disk timeout' for all internal and FireWire attached drives (same for SSD and HDD) after about 15 minutes.
Any suggestions greatly appreciated.