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2. RAID Levels
This section details the RAID levels which the disk array controller can support.
2-1. Characteristics of RAID Levels
The table below lists the characteristics of the RAID levels.
Level
Function
Redundancy
Characteristics
RAID0
Striping
No
Data read/write at the highest rate
Largest capacity
Capacity: (capacity of single HDD) ×
(number of HDDs)
RAID1
Mirroring
Yes
Two HDDs required
Capacity: capacity of single HDD
RAID5
Striping of both data
and redundant data
Yes
Three or more HDDs required
Capacity: (capacity of single HDD) ×
((number of HDDs) - 1)
2-2. RAID0
In RAID 0, data to be recorded is distributed to HDDs. The mode is called "striping".
In the figure below, data is recorded in stripe 1 (disk 1), stripe 2 (disk 2), and stripe 3 (disk
3)
…
in the order. Because RAID0 allows all HDDs to be accessed collectively, it can
provide the best disk access performance.
Notice
RAID 0 cannot have data redundancy. If a HDD is defected, the data saved
in the HDD cannot be recovered.
Disk array controller
Disk 1
Disk 2
Stripe 1
Disk 3
Stripe 4
Stripe 2
Stripe 5
Stripe 3
Stripe 6
Summary of Contents for N8103-91
Page 25: ...5 4 各部の名称と機能 本製品の各部の名称を以下に説明いたします 本製品表面 3 1 5 2 4 6 本製品裏面 ...
Page 124: ...104 When the adapter is selected on Adapter Selection the WebBIOS Top Menu appears ...
Page 126: ...106 Click Next to see the detailed settings of this controller ...
Page 136: ...116 Use this menu to define several physical drives PD as a disk group DG ...
Page 157: ...137 59 Setting menu for VD 0 is displayed ...
Page 165: ...145 ...