Which nested RAID level combines block-level striping with distributed parity?

Which nested RAID level combines block-level striping with distributed parity?

• RAID 30
• RAID 60
• RAID 50
• RAID 10 

EXPLANATION

RAID 50 (RAID 5+0)

A RAID 50 combines the straight block-level striping of RAID 0 with the distributed parity of RAID 5. This is a RAID 0 array striped across RAID 5 elements. It requires at least 6 drives.

Provides great balance between storage performance, storage capacity, and data integrity that’s not necessarily found in other RAID levels.One drive from each of the RAID 5 sets could fail without loss of data.

The time spent in recovery (detecting and responding to a drive failure, and the rebuild process to the newly inserted drive) represents a period of vulnerability to the RAID set.