Server won't boot after adding a new RAID array

My Dell Poweredge R720 uses the PERC H710P Mini BIOS config utility 4.03-0002 and has been running RHEL 6 on a RAID1 array (Made up of 2 3TB WD SAS HDs). I installed 2 more SATA drives today as a separate RAID1 array (With the intent of using dd to clone my older drivers to these new drives), and now RHEL6 on my original RAID array won't boot. In the RAID utility, they show up as unconfigured physical disks, and my new ones show up as the new virtual disk 0. I couldn't see anywhere to tell the utility that I still need my old drives to be the primary virtual disk/boot device... Thanks in advance for your time.
meicompanyIT ManagementAsked:
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You should never fit disks cold, the controller has picked up the new ones but lost the old ones somehow.

I would power off and remove all disks, reboot and go into the BIOS configuration and reset the controller so it does not have any config. Thern power down again and fit the old disks in their original locations, power on and if you are lucky it will say foreign disks detected and give you the chance to import their configuration. If that doesn't work then there is a very dodgy option of re-tagging the array or putting one of the disks on a non-RAID HBA to recover the data if you do not have a backup.

Do you get a "No Boot Device Available" when you start the server?

Press Ctrl + R during the POST process to open PERC BIOS Configuration Utility.
Press Ctrl + N to go to the PD Mgmt (Physical Disk Management) screen and check if any hard drives are offline or missing

Check to see that that the Virtual Disk is online and in an optimal state.

If this won't give you any clue that you can try to boot from the Dell Support Live Image designed to tackle misconfigured raid setups.

Also, where the disks added with the being turned off? That might have mixed things up. Be sure to always 'hot' add the disks ie. with the OS booted.

meicompanyIT ManagementAuthor Commented:
Thanks for the reply. I do. And when I go to the PD Mgmt page in the PERC BIOS Configuration Utility, I see that my original disks (where my OS is) are "Ready" where my new ones are "Online." The only Virtual Disk (0) is now my new disks, and I couldn't see a way to create another virtual disk using my original disks.  Just to clarify, I do not need to boot into my new RAID array this time, only my original one.

When I added the new disks, I powered the system all the way off, installed the disks, then booted into the PERC BIOS Configuration Utility. Should I have booted into the OS first?

It's been a while since I've messed with RAID arrays, so I appreciate the assistance.
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meicompanyIT ManagementAuthor Commented:
Thank you all for your time. I can now boot into my original RAID array after I powered off, removed the new discs, and reconfigured the original disks. Back to square one now, plus one additional challenge. One of my original disks has failed so I'm no longer in a RAID1 array, so I'd like to replace that disk and rebuilt that RAID. Then I also need to add the second RAID1 array with the new SATA disks, which was my original objective. Any tips are appreciated! Do I need to rebuild my original RAID 1 array before creating this second RAID1 array, or am I ok to go ahead and hot plug in these new ones with the OS (RHEL6) running?

I'd like to see the failed disk replaced before adding the new ones although you can put them in and go into OMSA and take a look to see if it will let you configure a new array.

You should not be using the BIOS utility, you have to reboot to use that. Use OMSA instead, if it's not installed here's a link:
Fortunate they didn't delete the metadata at POST, that's one reason you don't reboot to add new disks or modify the array.
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