NEC Express5800 120Rj-2 User Manual page 86
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Also See for Express5800 120Rj-2:
- User manual (574 pages) ,
- Maintenance manual (238 pages) ,
- Installation manual (75 pages)
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User Guide
Hot-Swap
The hot-swap enables a HDD to be removed (or replaced) under system operation.
Hot-Spare
The hot-spare is prepared as an auxiliary HDD substituting for a defective HDD
included in a virtual drive which is configured at a redundant RAID level. Detecting a
HDD fault, the system disconnects the HDD (or makes it offline) and starts Rebuild
using the hot-spare.
RAID Levels
The table below lists the characteristics of the RAID levels.
Level
Function
RAID 0
Striping
RAID 1
Mirroring
RAID 5
Striping of both data
and redundant data
RAID 6
Striping of both data
and redundant data
To use RAID 5 or RAID 6 with Internal RAID Controller, you
need to install the optional RAID Upgrade Kit.
Figure 31: RAID Levels Characteristics
Redundancy
No
Yes
Yes
Yes
Caution
Characteristics
Data read/write at the highest rate
Largest capacity
Capacity: (capacity of single HDD) × (number
of HDDs)
Two HDDs required
Capacity: capacity of single HDD
Three or more HDDs required
Capacity: (capacity of single HDD) × ((number
of HDDs) - 1)
Three or more HDDs required
Capacity: (capacity of single HDD) × ((number
of HDDs) - 2)
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