No idea about legacy / uefi BIOS personally. Depends on what system your running too I think. I could be wrong, but I remember reading about Unraid not liking UEFI all that much.
A for IT Mode needed for JBOD ... yes, thats my understanding. The card needs to be in IT mode in order to pass the drives through to the OS system directly. (Although some cards like the H310 have a psuedo IT mode built in ... ie. shows the drives to the OS as normal, but something like an H310 has a limited queue depth - it would still need to be flashed to full IT mode to increase the queue depth for better performance)
Determining whether a card is in IT mode ... not 100% sure, my setup was slightly different, but from another page:
"Install your HBA card into a suitable PCI slot and enter its configuration page by pressing CTRL-C during boot *. You will see a page confirming the model and firmware revision installed on your card as below."
* On my Dell R520, I'm fairly sure on boot, it does show a text option to Ctrl-C to enter into its settings. A bit like hitting F2 to get into the bios really.
The config screen should list the card and the firmware version. If its IT - the firmware should end in "IT". If its still in raid mode, then it should end in "IR" ( I think ).
The art of server channel on youtube has a lot of videos discussing the PERC cards in various forms, diagnosing and flashing them etc. If you watch some of his videos, you'll maybe see some of the commands and things he types when talking about the cards and their firmware versions. There are also a lot of videos out there.
- - - - - EDIT (1)
Tell you what, I have an Dell integrated H200 lying in the garage which I bought for a planned R710 server project. I didn't use it cause I bought an R520 instead. I'll throw it into my current rig (x470) and see if it shows a prompt during boot to CTRL-C into its settings.
- - - - - EDIT (2)
Right, I'm back ... Yes. (Once you have the card slotted in correctly), it will show a text splash screen giving the option to CRTL-C to get into the config. Hitting ctrl-c gives this:
Which then leads to this screen . . .
You can see on the FW Revision column, than my revision ends in "IR", which means it hasn't been flashed to IT mode. So knowing that, I could go through the process of flashing it. I flashed an H310mini in my server a while back and the process wasn't too hard. The H200 is meant to be easier than the H310mini which is one of the hardest.
And just for kicks ... yes, my desktop is a rainbow machine . . .
