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RAID variations explained

Advantages / Disadvantages of RAID 0 vs. RAID 1

Compliments of AC&NC Strategic and Innovative RAID solutions

RAID 0, 1

RAID 0: Striped Disk Array without Fault Tolerance


RAID Level 0 requires a minimum of 2 drives to implement





Characteristics/Advantages

RAID 0 implements a striped disk array, the data is broken down into blocks and each block is written to a separate disk drive

I/O performance is greatly improved by spreading the I/O load across many channels and drives

Best performance is achieved when data is striped across multiple controllers with only one drive per controller

No parity calculation overhead is involved

Very simple design

Easy to implement



Disadvantages

Not a "True" RAID because it is NOT fault-tolerant

The failure of just one drive will result in all data in an array being lost

Should never be used in mission critical environments
Recommended Applications

RAID 1: Mirroring and Duplexing


For Highest performance, the controller must be able to perform two concurrent separate Reads per mirrored pair or two duplicate Writes per mirrored pair.

RAID Level 1 requires a minimum of 2 drives to implement


Characteristics/Advantages

One Write or two Reads possible per mirrored pair

Twice the Read transaction rate of single disks, same Write transaction rate as single disks

100% redundancy of data means no rebuild is necessary in case of a disk failure, just a copy to the replacement disk

Transfer rate per block is equal to that of a single disk

Under certain circumstances, RAID 1 can sustain multiple simultaneous drive failures

Simplest RAID storage subsystem design




Disadvantages

Highest disk overhead of all RAID types (100%) - inefficient

Typically the RAID function is done by system software, loading the CPU/Server and possibly degrading throughput at high activity levels. Hardware implementation is strongly recommended

May not support hot swap of failed disk when implemented in "software"
Recommended Applications

Current M-Tech laptops models that support some form of RAID
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