Oh, okay. I'm still learning this whole Mac Pro resurrection process. Thanks for clarifying!
If you're dead in the water you can re-copy your boot.efi from your recovery partition back to the system partition and it should boot.
Now I have a question. Everything appears to work okay on this Mac Pro. Airdrop doesn't, but that seems hit or miss depending on what kinda wifi/bt card is in the system. The biggest gripe I have is that the machine doesn't suspend or even shut down the display per the power options. Is that simply because I'm still using an unsupported video card? Think that'll resolve itself when I put the 660 in there? I'm still waiting for my power connector to be delivered.
[doublepost=1468963083][/doublepost]Also, I have three 1TB disks in this thing I want to use as storage, but apparently I can't RAID 5 these things natively? Anybody have a suggested solution?
The suspend issue can sometimes be resolved by performing a PRAM reset and/or an SMC/PMU reset...
To reset the PRAM, reboot, when you hear the chime, hold down 4 keys Apple-ALT-P-R, release the keys when you hear the next chime.
To reset the SMC/PMU power off the MacPro, remover the power cord, open the side panel, look closely at the top right side of the motherboard, it sometimes helps if you remove the HDD sled in bay 4, you should see a small push button. Press and hold this push button for approx 5 seconds. Refit everything, then power on.
If none of those clears the fault, you might have a process running that isn't quitting/suspending. There are some techniques to find these ( I seem to remember someone detailing them on this thread, but there's 100 pages!!!!). You might look into the lsof command.
For RAID, MacOSX has a software RAID feature, but it's only really centred on spanning and mirroring (0 and 1 I think). There is CoreStorage, which is Apple's logical volume manager, but it don't think it takes RAID any further.
You can purchase Apple or third party PCI-based raid cards. These give you full featured hardware-based RAID. This is a neat solution since it is cable-less, plug it in and the 4 existing bays become RAID capable.....
Other than that it's external options. Personally I've built my own external RAID using
Icybox ib-555 for convenience, inside an external case, with an IOI SPM-393 SATA-based hardware RAID controller. You can then get an E-SATA cable set to bring the spare SATA ports to the rear of the MacPro