When the array has more than three physical drives, drives are mirrored in trios, and the fault-tolerance
method is known as RAID 10 (ADM). If a physical drive fails, the remaining two drives in the mirrored trio can
still provide all the necessary data. Several drives in the array can fail without incurring data loss, as long as
no three failed drives belong to the same mirrored trio. The total drive count must increment by 3 drives.
This method has the following benefits:
• It is useful when high performance and data protection are more important than usable capacity.
• This method has the highest read performance of any configuration due to load balancing.
• This method has the highest data protection of any configuration.
• No data is lost when two drives fail, as long as no two failed drives are mirrored to another failed drive.
• Up to two-thirds of the physical drives in the array can fail.
Double Parity
RAID 6
: RAID 6 protects data using double parity. With RAID 6, two different sets of parity data are used
(denoted by Px,y and Qx,y in the figure), allowing data to still be preserved if two drives fail. Each set of parity
data uses a capacity equivalent to that of one of the constituent drives. The usable capacity is C x (n - 2)
where C is the drive capacity with n drives in the array. A minimum of 4 drives is required.
34
System Architecture
Содержание StoreEasy 1X60 Storage
Страница 53: ...Volumes 53...
Страница 55: ...You can perform the following operations in the File Shares screen File Shares 55...
