RAID 6 writes data across all disks in the array and two parity blocks for each data block. If one physical disk
fails, the data can be rebuilt onto a replacement disk. With two parity blocks per data block, RAID 6 supports
up to two disk failures with no data loss. RAID 6 synchronizing from a failed disk is slower than RAID 5 due to
the use of double parity. However, it is far less critical due to its double-disk security.
A minimum of four disks is required to create a RAID 6 array. RAID 6 offers very good data protection with a
slight loss of performance compared to RAID 5.
Nested RAID levels
RAID 10
RAID 10 combines the protection of RAID 1 with the performance of RAID 0. Using four disks as an example,
RAID 10 creates two RAID 1 segments, and then combines them into a RAID 0 stripe. Such configurations
offer exceptional data protection, allowing for two disks to fail across two RAID 1 segments. Additionally,
RAID 10 writes data at the file level and, due to the RAID 0 stripe, gives users higher performance when
managing greater amounts of smaller files. This means a more generous input output per second for data,
referred to as IOPS.
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