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AEC-6896S/6896 Manual
It is suggested to compose RAID 1 with hard drives of the same capacity. Because
the capacity of mirrored disk array is that of the smallest hard drive. For example, a
100GB hard drive and a 120GB one unite into RAID 1. The capacity is 100GB.
A-3 RAID 0+1 (Striping/Mirroring)
RAID 0+1 is the combination of striping and mirroring. It has the advantages of two
RAID classes. The RAID controller allocates the writing of data equally among some
hard drives, and in the meantime backs up the data onto other hard drives. Accord-
ingly, it has the advantages of error tolerance and quick read/write speed. RAID
0+1 needs at least 4 hard drives in even number. Its calculation of capacity is the
same as RAID 1. A half of the capacity is used for backup. It takes the smallest hard
drive capacity as the calculation basis. For example, four 100GB hard drives unite
into RAID 0+1. The total capacity is 200GB.
A-4 JBOD (Just a Bunch of Disks)
JBOD (formal word spanning) is not a real RAID setting. It simply links a bunch of
disks into a big hard drive. It doesn't have the functions of quick read/write speed
and error tolerance. However, compared with RAID 0, JBOD doesn't waste the
hard drive capacity. Its capacity is the total of all hard drive capacities. For example,
set a 100GB hard drive and a 120GB one as JBOD. The capacity is 220GB. When
one of the two hard drives fails, it is easier to restore data. Because data are written
into the first hard drive, and then into the second one after the first one is used up.
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