Which RAID configuration allows the failure of two disks in each RAID 6 array?

RAID 6 is specifically designed to provide high availability and fault tolerance by allowing the failure of up to two disks within the array. This is achieved through the use of double parity, meaning that data and parity information are distributed across all disks in the array. In the context of RAID configurations, RAID 60 builds upon RAID 6 by combining it with RAID 0, thus offering the benefits of both configurations.

RAID 60 consists of multiple RAID 6 arrays striped together, which enhances performance while simultaneously providing the robust data protection of RAID 6. Because RAID 60 retains the double parity feature inherent to RAID 6, it maintains the capability to withstand simultaneous failures of two disks within each RAID 6 segment. This makes RAID 60 an ideal choice for environments where high data availability is critical and where budget allows for greater complexity in storage solutions.

In contrast, options like RAID 50, RAID 1, and RAID 10 have their unique fault tolerance mechanisms but do not offer the same level of protection against two disk failures as RAID 6 or RAID 60 does.