HP ACU shows parity initialization failed on Smart Array controller

Another reason to be wary of large RAID 5 arrays...

Imagine what your rebuild times will be when (not if) you have a failure. Please consider using fewer SATA disks in your setup. There's a chance you already have errors on your existing disks!

Smart Array RAID controllers run a background parity initialization upon the creation of a new logical drive.

From the controller technology guide:

When you create a RAID 1, RAID 5, or RAID 6 logical drive, the Smart Array controller must build the logical drive within the array and initialize the parity before enabling certain advanced performance techniques. Parity initialization takes several hours to complete. The time it takes depends on the size of the logical drive and the load on the controller. The Smart Array controller creates the logical drive, initializing the parity whenever the controller is not busy.

Please see:

"Parity Initialization Status: In Progress" for long time

Slow parity initialization of RAID-5 array on HP Smart Array P411 controller