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G-SPEED Product Guide
Page 17
APPENDIX A
RAID
Level Description Advantage
Level Description Advantage
Disadvantage
Ideal
For…
0
Disk striping Offers the highest
performance and
useable storage
capacity
useable storage
capacity
No fault tolerance -
failure of one drive
in the array results
in complete data
loss
failure of one drive
in the array results
in complete data
loss
Content creation
applications
applications
1
Mirroring
High level of fault
tolerance
tolerance
Not the most
efficient in regards
to capacity as
useable storage
space is cut in half
efficient in regards
to capacity as
useable storage
space is cut in half
Applications in
which data
security is
paramount
which data
security is
paramount
3 Disk
striping
with
dedicated
parity drive
dedicated
parity drive
High level of
read/write
performance, fault-
tolerant, disk
failure has
insignificant impact
on performance
read/write
performance, fault-
tolerant, disk
failure has
insignificant impact
on performance
Content
creation
applications
requiring high-
performance and
data security
requiring high-
performance and
data security
5 Disk
striping
with
distributed
parity
distributed
parity
High read
performance,
medium write
performance, fault-
tolerant
performance,
medium write
performance, fault-
tolerant
Disk failure results
in drop in
performance
in drop in
performance
File servers,
database
applications
database
applications
6 Disk
striping
with dual-
distributed
parity
distributed
parity
An extension of
RAID 5 with a
second
independent
distributed parity
scheme. High level
of fault tolerance.
Two drives in the
array can fail
without data loss.
RAID 5 with a
second
independent
distributed parity
scheme. High level
of fault tolerance.
Two drives in the
array can fail
without data loss.
Lower performance
than RAID 3 or
RAID 5
than RAID 3 or
RAID 5
Mission critical
data
data
JBOD Just-a-
bunch-of-
disks
disks
Each drive can be
accessed as an
individual volume.
accessed as an
individual volume.
No fault tolerance
Audio
applications
applications