Raid0+1 - Samsung SVS-5R User Manual

User's Manual

4.1.3 RAID0+1

The SVS-5R supports RAID0+1. Using RAID0+1 requires 4 SATA hard drives. When
configured to RAID0+1, the SVS-5R saves data as shown in the picture below. RAID0+1 uses
both striping (RAID0) and mirroring (RAID1); it will store identical data to 2 RAID0 disk arrays.
Thus, data is not lost even if a SATA hard drive or either disk array should fail. When a SATA
hard drive or a disk array fails, the SVS-5R continues saving data to the other RAID0 disk array.
To ensure data stability, however, it is highly recommended that you replace a failed hard drive
and rebuild the RAID array. In the RAID0+1 mode, total storage capacity of the SVS-5R is
simply the capacity of 2 drives; please check total storage capacity of the SVS-5R before
configuring it to RAID0+1. The following describes possible instances when 2 SATA hard drives
simultaneously fail during the RAID0+1 mode.
e.g.) HDD#1, HDD#2 fail
HDD#1, HDD#3 fail
HDD#1, HDD#4 fail
HDD#2, HDD#3 fail
HDD#2, HDD#4 fail
HDD#3, HDD#4 fail
Block1
Block3
Block5
[HDD#1]
Rebuilding Can be rebuilt
Halt, Entire data is lost
Can be rebuilt
Can be rebuilt
Halt, Entire data is lost
Can be rebuilt
Block1
Block2
Block3
Block4
Block5
Block6
Mirroring
Block2
Block4
Block6
[HDD#2]
Striping
Block1
Block3
Block5
[HDD#3]
Striping
24
SVS-5R
(RAID0+1)
Block2
Block4
Block6
[HDD#4]