HP 2760p manual Advantages of RAID modes supported, Fault tolerance, Performance

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The advantages of RAID modes supported

Fault tolerance and performance are important terms to understand when choosing a RAID mode.

Fault tolerance

Fault tolerance is the ability of a RAID array to withstand and recover from a drive failure. Fault tolerance is provided by redundancy. Therefore, RAID 0 has no fault tolerance because it does not copy data to another HDD. With RAID 1 and Recovery, one drive can fail without causing the array to fail. With Recovery, however, the restoration of a single file or an entire HDD is much simpler than with RAID 1 alone. With RAID 5, one of the three HDDs can fail without causing the array to fail.

Performance

Performance is easy to understand, but it is difficult to measure because it involves several factors, some of which are beyond the scope of this document. Overall storage performance is determined by write performance and read performance, both of which vary based on the RAID technology selected.

RAID 0 (striping) improves overall storage performance because data can be written and read simultaneously across two HDDs.

Recovery and RAID 1 (mirroring) writes the same data to both HDDs; therefore, write performance may be slower. However, data can be read from both HDDs, so the read performance can be higher than that of a single non-RAID HDD.

RAID 5 performs at a level between RAID 0 and RAID 1.

6 Chapter 2 RAID technology overview

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Contents RAID Product notice Table of contents Page Introduction RAID technology overview RAID terminologyRAID mode summary Flexible data protection RecoveryRAID modes supported RAID Or docking station HDD Advantages of RAID modes supported Fault tolerancePerformance Devices supported Operating systems and devices supportedOperating systems supported HP Sata drive option kitsESATA HDDs select models only HP Business computersHP Advanced Docking Station Advanced Host Controller Interface Intel Rapid Storage Technology featuresNative Command Queuing Hot plug capabilityAutomatic HDD switching and rapid recovery Intel Rapid Recover TechnologyMirror update policies Simplified migration from RAID to non-RAIDRAID volume setup Enable RAID through the system Bios f10 Page Page Migrating to RAID Page Page Page Migrating to Recovery Page Page Page Migrating to RAID Page Page Migrating to RAID 5 select models only Page Page Allocating unallocated HDD space for an HP image Select Organize Folder and Search Options Hprecovery Page Modifying the volume update policy Page Page Resetting RAID drives to non-RAID Page Frequently asked questions Can more than one RAID volume be installed on a computer?Index HDD
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