Hp Command View EVA Software User Manual download pdf (Page 35)

Vraid overview

Vraid is an HP term for implementing RAID storage (Redundant Array of Independent Disks). Virtual

disks with HP Vraid use three key RAID methods: data striping, data mirroring, and parity error

checking.

Data striping improves speed by performing virtual disk I/O with an entire group of physical disks

at the same time. Data mirroring provides data redundancy by storing data and a copy of the

data. Parity error checking provides automatic detection and correction if corruption of a physical

disk occurs. Unlike traditional RAID, all HP P6000 Vraid levels distribute data across all available

physical disks.

HP P6000 SmartStart supports the following Vraid types or levels: Vraid0, Vraid1, Vraid5 and

Vraid6. Each type uses a different combination of RAID methods that impact data redundancy,

the amount of physical disk space used, and I/O speed.

Once a virtual disk is created, its Vraid type cannot be changed. The following summaries can

help you choose an appropriate type.

RAID

method

Data

redundancyBest PracticesSummary

StripingNone

IMPORTANT: HP does not

recommend using Vraid0 for virtual

disks when high availability is

required. Consider Vraid0 only for

noncritical storage.

Vraid0 (striping) and is optimized

for speed and disk space

utilization but does not provide

any redundancy.

Vraid0

Vraid0 virtual disks provide the best

performance for applications that

use random I/O.

MirroringHighIn general, Vraid1 virtual disks

provide better performance

Vraid1 (striping with mirroring) is

optimized for speed and high data

Vraid1

characteristics over a wider rangeredundancy. A Vraid1 virtual disk

of application workloads than

Vraid5.

can automatically recover

(reconstruct) from the failure of one

physical disk.

Vraid1 uses about twice the

physical disk space of Vraid0.

Striping and

parity

MediumVraid5 virtual disks provide as good

or better performance than Vraid1

Vraid5 (striping with parity) is

optimized for speed, disk space

Vraid5

for applications that use sequentialutilization, and moderate

writes. Vraid5 has much lowerredundancy. A Vraid5 virtual disk

random write performance incan automatically recover

comparison to Vraid1, but has much

higher capacity efficiency.

(reconstruct) from the failure of one

physical disk.

Vraid5 uses about 20% more

physical disk space than Vraid0.

Striping and

dual parity

HighestPerformance characteristics of

Vraid6 for random or sequential

Vraid6 (striping with dual parity)

is optimized for speed and the

Vraid6

write workloads will be slightlyhighest redundancy. A Vraid6

lower than Vraid5. Vraid6 providesvirtual disk can automatically

the highest level of redundancy

protection of all Vraid types.

recover (reconstruct) from the

concurrent failure of two physical

disks. Vraid6 support is dependent

on the controller software version.

See the HP P6000 Enterprise

Virtual Array Compatibility

Reference.

Vraid6 uses about 33% more

physical disk space than Vraid0.

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