Hi,   You may need to replace the drive 1 by 1 to rebuild the array, if you were to replace all the drives in the server, and all of the drives are in 1 RAID array.    Based on the knowledge I've being involve in array building, if you were to replace all drives, I suggest to build the array from ground level, and copy the data back in from back up. This you can avoid RAID puncture, which you might want to avoid.    Do let me know if you have any other questions.
I need to replace all 12 Hard drives in a RAID 5 Array due to age .  There are no hot spares allocated.  Is there any faster way to replace them all without damaging my array or is 1 by 1 and waiting for rebuild the only way?
PERC H730 Hard Drive Replacement