OpenManage Server Administrator (OMSA) can be used to monitor RAID, including rebuild progress: www.dell.com/.../poweredge-2850 Download and run it to extract the files, then run C:\Openmanage\windows\setup.exe.  Choose Custom and make sure that Storage Management is installed, as out-of-date drivers/firmware can disable this module in a default installation. Once installed, add yourservernameoripaddress:1311 to your Intranet Zone, then open OMSA ... go to Storage, PERC, Virtual Disks to see the progress of your rebuild. Alternatively, you can see the rebuild progress in the CTRL-M utility during POST ... if you can afford a reboot.
I've got a PowerEdge 2850.  A couple of hours ago I replaced a failing/failed HD in the RAID-5 array.  It looks OK to me, but I'm wondering if there's any way for me to determine that it is being rebuilt from the other 2 HD's, or what's going on with it?  Is there a RAID management tool that's on these servers, or no?  (We're using Windows 2003 R2 Server.)
How do I determine if the new HD I've put in, is being rebuilt?