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User Guide
86
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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.
Caution
To use RAID 5 or RAID 6 with Internal RAID Controller, you
need to install the optional RAID Upgrade Kit.
Figure 33: RAID Levels Characteristics
Level Function Redundancy Characteristics
RAID 0 Striping No Data read/write at the highest rate
Largest capacity
Capacity: (capacity of single HDD) × (number
of HDDs)
RAID 1 Mirroring Yes Two HDDs required
Capacity: capacity of single HDD
RAID 5 Striping of both data
and redundant data Yes Three or more HDDs required
Capacity: (capacity of single HDD) × ((number
of HDDs) - 1)
RAID 6 Striping of both data
and redundant data Yes Three or more HDDs required
Capacity: (capacity of single HDD) × ((number
of HDDs) - 2)