You must clear the foreign configuration.  Go to Storage, PERC, Information/Configuration (link at top of page), then Foreign/Clear from the dropdown menu of Available Tasks for the controller.  Then you can assign the disk as a hot-spare to start the rebuild.
Hello Dell and world, Currently I have a PERC 6/i on PE2950 with a failed HDD and replaced with HDD that shows up as FOREIGN [The drive arrived as new and I would like to clear to use for RAID5 rebuilt] Here are the links to screenshots of DELL OMSA with issues shown:  PIC1: [IMAGE] PIC2: [IMAGE] PIC3: [IMAGE] PIC4: [IMAGE] Please review the pictures provided and let me know what would be the best step to approach this issue. Thank you!  -Hiphoptech
Poweredge 2950 PERC 6/i RAID 5 OMSA REBUILD / FOREIGN HDD ISSUE