RAID 0 Frequently Asked Questions

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RAID 0 Characteristics

How does reliability of a RAID 0 depend on the number of disks?

Reliability of a RAID 0 decreases with the number of member disks. It is known that the probability of a disk failure within a year is about five percent. Assuming that disks fail independently, for an array of three member disks the probability of failure is fourteen percent; for an array of five disks - twenty three percent.

In general case, the probability that an array consisting of N member disks fails due to a disk failure can be calculated as (1-0.95N). For more details about an estimation of RAID reliability visit free RAID failure calculator.

Does a RAID 0 provide performance increase?

Yes, a RAID 0 is the most efficient array in terms of read and write speed among the arrays with the same number of disks. For an array of N disks, RAID0 provides N times read and write speed increase as compared to a single disk.

What RAID 0 should I use - software or hardware and why?

There is no definite answer because it depends on the specific requirements to the array. When selecting RAID 0 type, consider the following:

Software RAID0:

  • cheap - can be created either by Linux or Windows home edition,
  • it is not possible to create a bootable software RAID0.

Hardware RAID0:

  • more expensive,
  • allows to create a bootable array.
To lern more about differences between software and hardware RAID 0 you should visit this site.

What is the best block size for a RAID0?

If you plan to work with the small files, choose one size smaller than the default setting. For the large files (e.g. video) - one size greater. If you are not sure about typical file size you are going to work with, then choose the default value.

What is better to use for a hardware RAID0 - controller with backup battery or without?

Generally, it doesn't make much sense to use backup battery in RAID0.

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