Thecus N2520 series, Руководство пользователя

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Chapter 3: System Administration
Building a RAI� volume may be time consuming, depending on the size
of hard drives and RAI� mode. In general, if the RAI� volume building
process is up to “RAI� Building”, then the data volume is accessible.
Creating RAI� destroys all data in the current RAI� volume. The data will
be unrecoverable.
RAID Level •
You can set the storage volume as JBOD, RAID 0, RAID 1, RAID 5, RAID 6, or RAID 10 (depending on
model).
Level
Model
JBOD RAID 0 RAID 1 RAID 5 RAID 6 RAID 10
N2520/N2560   
N4520/N4560
     
RAID configuration is usually required only when you first set up the device. A brief description of
each RAID setting follows:
RAID Levels
Level Description
JBOD The storage volume is a single HDD with no RAID support. JBOD requires a minimum of 1 disk.
RAID 0 Provides data striping but no redundancy. Improves performance but not data safety. RAID 0 requires a minimum of
2 disks.
RAID 1 Offers disk mirroring. Provides twice the read rate of a single disk, but same write rate. RAID 1 requires a minimum of
2 disks.
RAID 5 Data striping and stripe error correction information provided. RAID 5 requires a minimum of 3 disks. RAID 5 can sus-
tain one failed disk.
RAID 6 Two independent parity computations must be used in order to provide protection against double disk failure. Two
different algorithms are employed to achieve this purpose. RAID 6 requires a minimum of 4 disks. RAID 6 can sustain
two failed disks.
RAID 10 RAID 10 has high reliability and high performance. RAID 10 is implemented as a striped array whose segments are
RAID 1 arrays. It has the fault tolerance of RAID 1 and the performance of RAID 0. RAID 10 requires 4 disks. RAID 10
can sustain two failed disks.