O.k.: this is really weired:
while my first attempt at the 20th of Jan. was a successfull installation of OSX 10.10.1 on ESXi 5.5.0u2 and i explored all the configuration options and backup-restore scenarios with that installation, i now try a clean install of the production system, but fail at the very same point: the VM is unable to pick up the OS on the very same USB installer drive (OSX 10.10.1) i used back then, it's the SAME drive, the same host hardware (MacPro5,1).
Configuration settings for the VM are also the same.
1) The USB drive is listed in ESXi:
"Bus 02 Device 02: ID 05dc:a201 Lexar Media, Inc."
2) ...and "connected" to the VM according to vSphere client; with the UID "host: localhost path:2/4 version:2"
3) and listed in "Boot Manager" as one of the "Bootable Operating Systems and Devices"
4) Boot option "Force EFI Setup" is set
5) the following parameters are set:
smc.present = "TRUE"
smbios.reflectHost = "TRUE"
ich7m.present = "TRUE"
But any time i try to boot off that drive, it fails, with lots of Event "No operating system was found. If you have an operating system installation disc, you can insert the disc into the system's CD-ROM drive and restart the virtual machine".
The single difference this time: the ESXi 5.5 is fully patched, and the "Free" license has been applied (my first, successful attempt was a host in "Trial" mode).
Since i know that a lot of features get lost upon registering the "Free" license, is it possible that some functionality got lost, required for the same installation that succeeded the last time?
I try everything to avoid to install the 10.10-server as an upgrade from earlier versions, since my experiences with upgrades from 10.8 to 10.9 and then to 10.10 have been pretty bad in terms of system stability etc, while the clean installations run just fine...
Is there anything else a can try in order to help the VM to recognize the system?
Any hint highly appreciated