Xtore NASolution NP1040, Руководство пользователя

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NFP Storage Manager 1.1 User’s Manual
Chapter 4. Using NFP Storage Manager 1.1
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RAID 1
RAID 1 will use half of the volume as one-t o-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 RAID 5
volume requires selection of at least three hard disks of the same disk
space.
RAID 5 with hot spare
In RAID 5 with hot spare volume type, a spare hard disk is added to a
RAID 5 volume. This volume type will use one hard disk space to
store redundancy and keep a disk as a spare. Thus if
n hard disk
space is selected, the actual space available is n-2 hard disk space.
When any hard disk is malfunctioned, the spare hard disk space will
be on-line and replace the malfunctioned disk automatically. This
volume type can provide timely data reconstruction better than RAID
5.
Remove volume
To remove a volume, please select the volume and click Remove .