Linux – PERC 5 RAID disk with foreign data

Dell has instructions to do this. They're located here:

http://support.dell.com/support/edocs/software/svradmin/5.0/en/omss_ug/html/movdisks.html

Welcome to serverfault! Based on the information you supplied in your "answer" post (you should edit your question to supply extra information, not post an answer):

Oh dear. Looks like you had a failed disk, and then the array ejected another disk for whatever reason - given that the outcome of whatever happened was fatal, it either ejected one of the "working" drives during the rebuild onto the hotspare (taking you to two failed/unavailable disks from the current working set), or you didn't have a hotspare and the ejection took you to two offline disks. Two disks offline in RAID5 = sudden death.

You can probably kiss the data on this array goodbye - at best you're already going to have some filesystem corruption from the data that couldn't be flushed out from cache to disk.

In any event, your raid set is "not functional" (your virtual disks are offline) so based on Dell's instructions that you have found, you should "import" the foreign array and hope it adds it back in to the existing raid5 array without too much damage resulting from the unclean state - but basically you should already be preparing to start from scratch, because there's every chance the controller will just create an additional set of offline virtual disks with all but one drive missing based on the "imported" "foreign" disk.

If by some miracle it appears to work okay you should do extensive checks that everything you need to be readable/functional on this server is in fact readable/functional - or better yet, plan to reinstall it anyway, because after this kind of failure, the integrity of the data on the volume is under serious doubt.

You make no mention of if you were aware that one of the drives was already failed, so as a follow-up action, ensure you have monitoring configured for all your RAID arrays to try and minimise risk going forward.