what is the difference between raid 0 and raid 1

what is the difference between raid 0 and raid 1

RAID is a know-how that mixes two or extra disk arrays into logical items, so it behaves as a single drive to offer advantages resembling improved efficiency, higher fault tolerance, and enhanced reliability. This grouping will be applied via {hardware} or software program. These disks will be grouped in lots of forms of configurations known as RAID ranges. A number of the common varieties are RAID 0, RAID 1, RAID 5, RAID 6, and RAID10. Every of those RAID ranges is designed to realize a selected purpose. On this article, let’s check out the variations between RAID 0 and RAID 1, their advantages, shortcomings, and which works effectively in several conditions.


Additionally known as disk striping, this configuration divides information throughout completely different disks, so the read-write can occur concurrently throughout a number of disks and, within the course of, enhance its total pace. Right here, a stripe is the information that’s divided throughout a number of disks whereas a striped unit is the information out there on a single drive. This striping can occur in some ways. For instance, let’s say we now have 10 arduous disks and 32MB of knowledge that must be striped throughout the completely different disks. Some programs may stripe 1KB of knowledge from disk 1 to 10 after which begin over again whereas others may stripe information via the odd numbers first and the even numbers subsequent. It is determined by whether or not the striping occurs on the byte, block, or partition ranges.

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Some great benefits of RAID 0 are:

  • Improved efficiency: When information is striped throughout 4 drives, it offers 4 occasions extra bandwidth. If we assume that every drive runs at about 250 Enter Output Operations per Second (IOPS), this setup may have 1000 IOPS, thereby making it super-fast for customers.
  • No overhead: Since RAID 0 doesn’t use parity, there’s no overhead, and the complete drive’s capability is used for storing.
  • Low price: Amongst all RAID ranges, this configuration prices the least and is supported by all RAID controllers.
  • Simple to implement: There’s nothing a lot to arrange for RAID 0, and this makes it the best and quickest to implement.


The draw back of RAID 0 is that it has no parity and therefore no-fault tolerance. This implies, in case your information is corrupted or misplaced, there is no such thing as a resiliency or again up, and it’s inconceivable to retrieve the misplaced information. This makes RAID 0 utterly unsuitable for crucial information.


Additionally known as mirroring, this RAID stage replicates information throughout two or extra disks for higher redundancy. This configuration requires a minimal of two drives, so information will be written to each concurrently. This makes learn operations quick as the information will be learn from each the drives on the similar time. Nevertheless, write operations shall be slower for the reason that information must be written to 2 disks.


  • Knowledge redundancy: The most important benefit of RAID 1 is information redundancy, as information is replicated throughout two or extra disks.
  • Fault tolerance: This stage is most-suited for mission-critical purposes as a result of when one drive fails, the opposite will robotically take over. Since each the drives comprise equivalent information, there shall be no influence to customers.
  • Excessive availability: Since information is replicated throughout a number of disks, it will likely be out there when wanted, and the potential of information loss could be very negligent.
  • Excessive efficiency: Knowledge will be learn from two or extra units concurrently, so it’s quick.


  • Decreased storage capability: Because the similar information must be saved twice, your total storage capability is halved.
  • No real-time swapping: When a disk goes down, the secondary disk doesn’t take over robotically. The system must be restarted earlier than the secondary disk takes over, and this could be a little bit of an inconvenience.
  • Costly: This RAID stage requires more room to implement, so it’s costlier when in comparison with RAID 0.

Actual-time situations

Now, let’s run via some real-life situations and the best RAID stage for every.

Excessive pace learn and write

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You have got a state of affairs the place you need the learn and write to be tremendous fast, however the information just isn’t so crucial. This implies, even when there’s a information loss or corruption, it doesn’t have an effect on your small business so long as the read-write is fast.

The perfect instance of this state of affairs is caching stay stream video. Right here, pace and efficiency take priority over information loss and corruption, and for this state of affairs, RAID 0 is the only option.

Momentary information

Your purpose is to offer fast outcomes to your customers, so high-speed I/O is a should. On the similar time, you’re not so nervous concerning the lack of information as you’ve gotten a grasp copy in one other storage gadget that may be recovered simply when wanted.

On this case, RAID 0 is the only option.

Low disk house

In case you have extra information to retailer and run out of disk house, RAID 0 is an effective selection as there aren’t any overheads, and the complete disk house shall be used for storing. That stated, there’s no fault tolerance or backup both, so the information you need to retailer have to be non-critical and shouldn’t influence your small business even when it’s misplaced or corrupted.

Mission-critical information

If you need to retailer crucial and delicate information, RAID 1 is your finest guess because it mirrors information on two disks, so even when there’s a drawback with the first disk, you possibly can all the time retrieve the content material from the second.

Typically, RAID 1 is an effective selection if information redundancy is a key characteristic of your storage wants.

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It’s necessary to notice that RAID 1 just isn’t a backup possibility as a result of when a corrupted information is distributed from the working system, it writes to each the drives, thereby corrupting each the drives.


Many players like to make use of RAID 0 as a result of it’s simple to arrange and gives significantly sooner speeds that, in flip, enhances their gaming expertise. However some players don’t want utilizing RAID 0 due to the potential of information loss whereas many take pleasure in its elevated throughput. It’s a private selection between information security and excessive pace.

A number of customers

In case you have many customers requesting the identical content material, a RAID 1 setup will work because it gives excessive pace reads. Because the similar information is mirrored throughout completely different disks, the identical content material will be accessed sooner when a number of customers request for it concurrently.

RAID 0 or RAID 1? It comes all the way down to efficiency or information redundancy

RAID 0 and RAID 1 are two forms of configurations or ranges that may be arrange with an array of impartial disks. RAID 0 gives striping, which interprets to higher efficiency, however no-fault tolerance or information redundancy. RAID 1, however, gives mirroring, so the identical information is out there in two disks. RAID 1 is barely slower than RAID 0 as a result of there are two writes, however the learn operations are equally quick.

Because of the above variations, these RAID ranges work effectively in several situations. Typically, while you want efficiency over information redundancy, RAID 0 is your selection, whereas RAID 1 is the selection while you’re dealing with mission-critical information the place redundancy is a should.

We hope the above conditions offer you a greater thought of the place to make use of RAID 0 and RAID 1. For extra on RAID ranges, test the hyperlinks under for different articles on this sequence. And do share with our readers the completely different conditions the place you’ve gotten used the 2 ranges we talked about on this article.

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Extra RAID ranges articles
  • RAID 5 vs. RAID 6: When to make use of every stage and why
  • RAID 10 vs. RAID 5: When to make use of every stage and why
  • RAID 1 vs. RAID 5: When to make use of every stage and why
  • {Hardware} RAID vs. software program RAID: Execs and cons for every
  • RAID ranges defined: How they will profit your small business