NEC N8403-019, User Manual

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2. RAID Levels
This section details the RAID levels that the disk array controller supports.
2-1 Characteristics of RAID Levels
The table below lists the characteristics of the RAID levels:
Level Function Redundancy Characteristics
RAID0 Striping No Fastest data read/write
Largest capacity
Capacity: (capacity of single HDD) × (number of HDD
‟s)
RAID1 Mirroring Yes Two HDD
‟s required
Capacity: capacity of single HDD
2-2 RAID0
In RAID 0, data is distributed between HDD
‟s. This mode is called "striping."
In the figure below, data is recorded in stripe 1 (disk 0) and stripe 2 (disk 1). Because RAID0 allows HDD
‟s to
be accessed collectively, it can provide the best disk access performance.
Notice
RAID 0 does not provide data redundancy. If a HDD fails, the data saved
on the HDD cannot be recovered.
Disk array controller
HDD 0
Stripe 1
HDD 1
Stripe 3
Stripe 2
Stripe 4