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Explain RAID0, RAID1, RAID3,
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Answer / sbrahman75
RAID 0 Concatenation/Striping
RAID 1 Mirroring
RAID 5-Striped array with rotating parity.
Concatenation: Concatenation is joining of two or more disk
slices to add up the disk space. Concatenation is serial in
nature i.e. sequential data operations are performed
serially on first disk then second disk and so on. Due to
serial nature new slices can be added up without having to
take the backup of entire concatenated volume, adding slice
and restoring backup.
Striping: Spreading of data over multiple disk drives mainly
to enhance the performance by distributing data in
alternating chunks - 16 k interleave across the stripes.
Sequential data operations are performed in parallel on all
the stripes by reading/writing 16k data blocks alternatively
form the disk stripes.
Mirroring: Mirroring provides data redundancy by
simultaneously writing data on to two sub mirrors of a
mirrored device. A submirror can be a stripe or concatenated
volume and a mirror can have three mirrors. Main concern
here is that a mirror needs as much as the volume to be
mirrored.
RAID 5: RAID 5 provides data redundancy and advantage of
striping and uses less space than mirroring. A RAID 5 is
made up of at least three disks, which are striped with
parity information written alternately on all the disks. In
case of a single disk failure the data can be rebuild using
the parity information from the remaining disks.
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