Good afternoon, You will be safe swapping out the drive.  Offline the drive, replace it and then insert the new disk and let the array rebuild on the new drive.  Regards,
Hello all, I have a Dell 1950, with a PERC 5/i in RAID 5 with 4 physical disks. One of the disks is showing a SMART error for possible fail, so I ordered a new drive. I assumed that the swap on this drive should be as easy as going into Dell Open Manage, placing the disk offline, putting in the new disk and rebuilding the array. I stopped my process when I received a warning for possible data loss. [IMAGE] I assume this warning is only for servers running a non-redundant virtual disk. Just want to make sure before a warning like the one above Thanks for the help!  
A SMART error is detected on a physical disk in a redundant virtual disk.