HP 4400 Guía de instalación descargar pdf (Pagina 10)

NOTE:

For the minimum supported configuration, and other configuration information, see the QuickSpecs

document at: http://www.hp.com/go/eva4400

System and performance expectations

To help determine the best way to configure your storage, rank the following three storage

characteristics in order of importance:

• Fault tolerance (high availability)

• I/O performance

• Storage efficiency

With your priorities established, you can determine which striping method and RAID level to use.

As highlighted in the following section, some configuration methods offer greater fault tolerance, while

other configuration methods offer better I/O performance or storage efficiency.

RAID levels

Vraid is the HP term for the implementation of RAID (Redundant Array of Independent Disks) storage.

Vraid is also referred to as redundancy in HP management software. Virtual disks with HP Vraid use

three key RAID methods: data striping, data mirroring, and parity error checking. Unlike traditional

RAID, all HP Vraid levels distribute data across all available physical disks.

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

at the same time. Mirroring provides data redundancy by storing data and a copy of the data. Parity

also provides data redundancy by storing data and the calculated parity for each stripe of data. If a

subset of the data on a physical disk becomes corrupt or the entire physical disk fails, the data can

be automatically recovered from redundancy so that data loss does not occur.

The EVA has four Vraid types: Vraid0, Vraid1, Vraid5, and Vraid6. Each Vraid type provides unique

I/O speed and has a different level of data redundancy, which directly effects the amount of physical

space used. Once a virtual disk is created, the Vraid type or level cannot be changed.

See Table 1 for a comparison of the different RAID levels.

Table 1 Raid Level Comparison

RAID meth-

Data redund-

ancy

Best practicesSummary

StripingNone

IMPORTANT: HP does not recom-

mend using Vraid0 for virtual

disks when high availability is

required. Consider Vraid0 only

for noncritical storage. Vraid0

virtual disks provide the best per-

formance for applications that use

random I/O.

Vraid0 is optimized for I/O

speed and efficient use of

physical disk capacity, but

provides no data redund-

ancy.

Vraid0

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