Raid 10 (Mirroring + Striping) - Fujitsu PRIMERGY RX200 S2 User Manual

A.4

RAID 10 (Mirroring + Striping)

In addition to striping (the process distributing data across multiple hard disks), RAID10 mirrors the
data for redundancy. For example, when writing six blocks of data (D0 - D5) with four hard disks,
each data block and redundant data are distributed across the hard disks (see below figure).
Reliability is enhanced by writing the data across four hard disks, and redundancy is achieved with
the redundant data. Although only half of the capacity of all hard disks is available, it is better perfor-
mance than RAID5.
D0
D2
D4
Disk1
D0
D2
D4
Disk2
RAID1
RAID0
D3 D4
D2 D5
D1
D0
Data
D1
D3
D5
Disk3
RAID1
D1
D3
D5
Disk4
57
A RAID Level