RAID 6T2
Learn how data is written to a RAID 6T2 array when using the Easy Tier® function.
RAID 6T2 is a RAID level that provides RAID 6 protection when using the Easy Tier function utilizing two different tiers of physical disk that have unique performance characteristics. Each tier functions as a single redundancy group and stripes data across all disks in the tier. Each tier is RAID 6 protected and writes P and Q parity data across all the disks in the tier. For a RAID 6T2 array that has one tier of four SSD disks and another tier of 5 HDD disks, array data and parity information is written in the following pattern:
If one or two disks fail in either RAID 6 tier, you can continue to use the entire array normally. A RAID 6T2 array that is operating with one or two failed disks in either or both tiers is said to be operating in degraded mode. Whenever data is read from a degraded disk array, the array controller recalculates the data on the failed disks by using data and parity blocks on the operational disks. A tier in a RAID 6T2 array with a single failed disk has similar protection as that of a RAID 5 array with no disk failures. If a third disk fails in either tier, the entire array is placed in the failed state and is not be accessible.
