Final answer:
A performance issue arises with parity based RAID levels due to the necessity of calculating and writing parity, which can slow down write operations and incur overhead. Non-parity RAID levels don't face this problem.
Step-by-step explanation:
A performance problem with parity based RAID levels is the expense of computing and writing parity. Parity calculations are necessary for RAID configurations that provide fault tolerance, such as RAID levels 4, 5, and 6. The need to calculate parity can introduce a significant overhead, especially during write operations, as the parity information must be updated every time data is written to the disks. This can slow down the overall performance of the storage system. RAID levels that do not use parity, such as RAID 0 or RAID 1, do not incur this same performance penalty because they either do not provide fault tolerance or use mirroring instead of parity checks. Therefore, the correct answer is b) parity based RAID levels.