  "You will have to use OMSA ... go to Storage, PERC, Virtual Disks, and choose Reconfigure from the dropdown menu of Available Tasks for your RAID 5."  well, I have the drive installed, it's showing up in physical discs in OMSA, with the others in my array, but Reconfigure is not one of the choices under available tasks.   Reconfigure is an option under VIRTUAL Disks, not Physical Disks - you apply that operation to the array, not the individual disks. You have two virtual disks configured across the same set of disks? That is called "slicing", and Online Capacity Expansion will not work if you have RAID slices configured on a disk group. You would have to do a backup/restore or delete the second VD, expand, recreate, restore.
I'm trying to add a drive to a RAID5 on the above for capacity expansion. It has a PERC H700 adapter. The verified answer in another thread on here for what sounds to me like what I'm trying to do was: "You will have to use OMSA ... go to Storage, PERC, Virtual Disks, and choose Reconfigure from the dropdown menu of Available Tasks for your RAID 5."  well, I have the drive installed, it's showing up in physical discs in OMSA, with the others in my array, but Reconfigure is not one of the choices under available tasks.  I have 2 virtual discs, maybe that's the issue? Both have the options: Delete, Check Consistency, Assign/Unassign Dedicated Hot Spare, Blink, Unblink, Rename, Change Policy, Slow Initialize, Fast Initialize, Replace Member Disk.  Anyone have any ideas? Thanks 
RAID 5 Powervault NX300 adding a drive