Hewlett-Packard 381513-B21 - Smart Array P800 Controller RAID Introduction Manual

Download Technology brief of HP 2000fc Adapter, Storage for Free or View it Online on All-Guides.com. This version of HP 2000fc Manual compatible with such list of devices, as: 2000fc, 2000i, 2000sa, 381513-B21 - Smart Array P800 Controller RAID, 411508-B21 - Smart Array E200/128 BBWC Controller RAID

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Table 1. Summary of RAID technologies for large arrays
RAID LEVELS Function/Applications Limitations
Data is distributed
across separate disk
drives.
RAID 0
Requires a minimum of one drive.
Image Editing • Video
Production • Pre-Press
Applications
Highly vulnerable
to failure. The
entire array will
fail if one drive
fails.
Mirroring - Identical
data stored on two
drives, high fault
tolerance, very good
performance (higher
read performance than
RAID 0).
RAID 1
Requires a minimum of two drives.
Accounting • Payroll •
Financial
Implemented as striped,
mirrored disks.
RAID 1+0
Requires a minimum of four drives.
Database applications
requiring high
performance and fault
tolerance; sacrifices
storage efficiency.
50% of capacity
dedicated to fault
protection.
Doubles the
number of drives
required.
One set of parity data
is distributed across all
drives. Protects against
the failure of any one
drive in an array.
RAID 5
Requires a minimum of three drives.
Pn represents one set of parity.
Transaction processing
• File and application
servers • ERP • Internet
and Intranet servers
Potentially risky
for large arrays.
Can only
withstand the loss
of one drive
without total
array failure. Low
write
performance
(improved with
battery-backed
cache).
Two sets of parity data
are distributed across
all drives. Protects
against the failure of
two drives in an array.
Provides higher fault
tolerance than RAID 5.
RAID 6 (ADG)
Requires a minimum of four drives.
Pn and Qn represent two sets of parity.
For 24x7 applications
that require a higher
level of fault tolerance
than RAID 5.
Lower write
performance than
other RAID levels.
Sequential and
burst-write
performance can
be much
improved with
battery-backed
cache.
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