D-Link DNS-6040 Инструкция по эксплуатации онлайн [83/185] 42283

D-Link DNS-6040 Инструкция по эксплуатации онлайн [83/185] 42283
DNS-6040M/DNS-6040 User’s Manual
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time.
Span
A span volume can be created by combing space from two
or more hard disks. The selected disks will be created as one
large, contiguous volume. The selected space in each hard disk
does not need to be equal in size.
RAID 0
RAID 0 will consider all the selected space as one large
hard disk. Since it will however perform parallel and multiple
read/write, thus it has better performance efficiency than Simple
or Span volume.
RAID 1
RAID 1 will use half of the volume as one-to-one data
mirroring, i.e. duplicate the same set of data from A to B to
ensure data security and integrity. Thus, the actual available
space is only half of the total space. This level of RAID can
ensure high level of data security, but because it only has 50%
utilization rate, the cost is relatively higher than other volume
types. The use of RAID 1 indicates high priority of data
security over cost consideration. There must be the selection
of two hard disks with the same size in creating a RAID 1
volume.
RAID 5
In addition to consolidating multiple (at least 3) hard disk
space of the same size to a large virtual hard disk to enhance
store/retrieval speed, RAID 5 utilizes one of the multiple storage
space to store redundancy (parity) to enable data reconstruction
in the future. Thus if there is n hard disk space, the actual
storage space for a RAID 5 is only n-1 disk space. This
volume type can ensure high level of data integrity and is more
cost effective than RAID 1 because of higher actual disk space
availability. It is suggested to select RAID 5 in situation where
there is a need for high level of data integrity. Creating a

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