I would update the firmware of the controller. Once you do, there will be a foreign config menu in the controller's BIOS. You can download the firmware here. <ADMIN NOTE: Broken link has been removed from this post by Dell>
You will need to make a set of floppy disks that you will boot to. If you do not have a floppy drive, you may need to call tech support cause I think they will have a ISO file that you can use to boot to a CD.
PERC 5 I Data recovery
Please be aware this is not a guarantee of data recovery and if the data is truly vital you may wish to contact a data recovery service.
5. Press <CTRL><E> during POST to enter the BMC.
6. Scroll down to System Event Log Menu and press <Enter>.
7. Select View System Event Log and press <Enter
8. Determine the order in which each disk went offline. Use the right and left arrow keys to scroll through the SEL log.
It is imperative to force the first disk to fail offline immediately after the retag is complete in order to keep from propagating data corruption.
In the following images, disk 2 was the first disk to go offline.
9. Reboot the system and press <CTRL><R> to enter the PERC 5 BIOS.
10. Scroll down to the failed virtual disk and press <Enter> to verify the configuration of the virtual disk and which members are missing.
The text of the failed virtual disk will be red.
Make a note of the RAID type, members of the array, size of the array, and element size. Element size is only used for RAID 5 and RAID 50 on the PERC 5. These setting will be required to recreate the identical virtual disk during the retag.
11. Select the failed virtual disk and press <F2>. Scroll down to Delete VD and press <Enter>.
12. Press <Enter> with OK selected to confirm the delete.
13. Scroll up to the controller and press <F2>. Scroll down to Foreign Config, press the right arrow and press <Enter> on Clear.
14. Press <Enter> with OK selected to confirm the clear.
15. Scroll up to the controller and press <Enter>, and then select Create New VD.
16. Select the appropriate RAID level and disk configuration, and press <Enter> with OK selected.
The disk configuration must be identical to the failed virtual disk that was deleted in step 11. Also make sure you are selecting the physical disk in the same order as they were in step 11. Notice the # column by each physical disk.
17. Press <Enter> to acknowledge that it is recommended to initialize all newly created logical disks.
Initializing a disk erases all data. The retag procedure is designed as a effort to recover data. Re-tagged disks should not be initialized.
18. Scroll down to Physical Disks, press the right arrow key, then scroll down to the disk that went off line first and press <Enter>.
19. Scroll down to Force Offline and press <Enter>.
20. Press <Enter> with OK selected to confirm the force offline.
21. Pull the disk out that was just forced offline and then reinsert the disk to start a rebuild.
If this does not start the rebuild, try creating the drive as a Hotspare.
22. Verify the rebuild has started and completes.
23. Verify the logical drive is now healthy.
24. Boot to the OS and verify the data is present on the re-tagged disk.