PlatinumNAS Owner’s Manual
RAID
Level
Description
M i n .
Drives
Max.
Drives
Capacity Data
Reliability
Data
Transfer Rate
I/O
Request Rates
JBOD
Also known as spanning. Data is
distributed sequentially to all drives.
There is no data protection.
1
4
(N)
Disks
No data protection
Same as a single disk
same as a single disk
0
Also known as striping
Data distributed across multiple drives
in the array simultaneously. There is no
data protection
1
4
(N)
Disks
No data
Protection
Very High
Very High for
Both Reads and Writes
1
Also known as mirroring
All data replicated on N
Separated disks. N is always a multiple
of 2. This is a high availability Solution,
but due to the 100% duplication, it is
also a costly solution.
2
4
1/2 (N)
Disks
Higher than RAID 5
Reads are higher
Than a single disk;
Writes similar to a single
disk
Reads are twice faster
than a single disk;
Write are similar to a
single disk.
Also
known
Block-Interleaved
distributed Parity.
Data and parity information is
subdivided and distributed across all
disk. Parity must be the equal to the
smallest disk capacity in the array.
Parity information normally stored on a
dedicated parity disk.
3
4
(N-1)
Disks
Lower than RAID 1, 10
Higher than a single
drive
Reads are similar to
RAID 0;
Writes are slower than a
single disk
Reads are similar to
RAID 0;
Writes are slower than a
single disk.
Appendix B: RAID Level Comparison Table
B-RAID Level Comparison Table
