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According to the adjusted stripe size (e.g., 16 KB) and the number of hard disks, the data
blocks are split into
stripes. Each stripe is
stored on a separate
hard disk. Especially
with sequential read
and write operations,
we can observe a sig-
nificant improvement
of the data through-
put. RAID 0 includes
no redundancy at all,
i.e., when one hard
disk fails, all data is
lost.
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All data is stored twice on
two identical hard disks.
When one hard disk fails,
all data are immediately
available on the other
without any impact on
the performance and data
integrity.
We talk about "Disk Mir-
roring" when two hard
disks are mirrored on one
SCSI channel. If each
hard disk is connected
with a separate SCSI
channel, this is called
"Disk Duplexing"
(additional security).
RAID 1 represents an easy
and highly efficient solu-
tion for data security and
system availability. It is
especially suitable for
installations which are
not too large (the capacity
available is only half of
the installed capacity).
