It "should" start rebuilding automatically, although there are many things that can prevent that from happening.  If it doesn't, then you can assign it as a hot-spare to begin the rebuild process.  Yes, always swap it 'hot'.  You may experience problems if using cheap consumer/desktop drives or non-certified drives.
Hi All,I have a PowerEdge 2900 with a PERC 6/i Integrated controler. I've four SAS disks working as a RAID 10. Recently one of the disks failed. I just bought a new disk to replace it. Can I replace the failed disk just by hot swaping it? Will the rebuild kick off by itself? Regards, Paulo
PowerEdge 2900 RAID 10 Failure