🖐 Which is better: RAID5 + 1 Hotspare / RAID6? - Server Fault

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Solved: Global hot-spare vs dedicated hot-spare - Dell Community
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Hot spares just add to the safety of arrays, they will become an full functioning active member of an array should a drive fail. Hotspares have.


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You're running the risk of loosing all you data should something happen to the remaining drive. If you have a hot spare you can immediately begin a rebuild.


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You're running the risk of loosing all you data should something happen to the remaining drive. If you have a hot spare you can immediately begin a rebuild.


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Having insufficient spares increases the risk of a disk failure with no available spare, resulting in a degraded RAID group. A spare disk is also required to provide.


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Solved: Hello everyone, I have 2 virtual disk configured with RAID5, each virtual disk has configured dedicated hot-spare. There is also.


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Ideally we should have RAID 6 that allows 2 harddisks failure. Having 3 harddisks failure within the rebuild windows is highly unlikely. Moreover, most users can't.


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another failure until the spare has been brought up to speed which could take there's a rebuild time (with the hot spare) in which you have no redundancy.


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You're running the risk of loosing all you data should something happen to the remaining drive. If you have a hot spare you can immediately begin a rebuild.


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For any RAID 5 or 6 you have to be carefull to use disks which are not from the same production run. These are the facts of the case, and they are undisputed by anyone who knows what they are talking about :. If you can afford the overhead, use RAID10 for highly disk-intensive applications. If you can do raid 6, you can do raid Trevor Trevor 19 1 1 bronze badge. A hot spare is untested and may actually fail immediately right when its needed. However, Raid 6 reads faster and controllers wont likely help in a real life workload to improve read performance. Post as a guest Name. If you have enough disks for raid 6, you've got enough to do a 10 volume. Power "consumed" is a double whammy too: it is converted to noise and heat and you end up needing more power to move the heat away. If your mobo goes out, you are asking for trouble. And for a whole cage or larger set of kit the total draw of an extra drive per compute unit soon adds up to something a sufficiently picky accountant might notice. Bombilious Dr. Sign up or log in Sign up using Google. In short: If safety is your main concern then go with RAID6 as it can survive any two drives failing at the same time. All RAID arrays eventually fail! Notice that in no case is RAID5 the best choice regardless of hotspare. Active 2 years, 6 months ago. There is a big difference between theory and the real world when it comes to RAID5.

Super User is a question and answer site for computer enthusiasts and power users. How Stack Overflow hires engineers. There is a difference between "the best choice" and "the best choice you can afford".

ServerFault has a good discussion on this. The raid is being down by a hardware controller lol i have heard too many things against software raid controllers.

Consider, if you have a RAID controller with 1 GB of cache, then the write usually under normal load - not some massive non normal high load scenario is immediate from the perspective of the user or application - it went to memory and then the 'actual' writing occurs at the performance of the drive.

If the environment makes it more likely that more than one disk fails within short time vibrations, humidity, dirtthen go for RAID 6.

Data from a failed disk is rebuilt onto the hot spare disk. Two drives will fail one right after the other about every 8. What is "Raid 6" excerpt from User Manual, Sect 4. Bombilious 31 2 2 bronze badges. If the servers' environment is pretty nice for hardware colo, climatized etc.

But in colo where you get X-amps-per-rack and pay a lot for any excess or excess is simply not permitted - sometimes if you go over you go darkit could be noticeable. Viewed 45k times.

Raid 6 is better for read and is more tolerant 2 versus one drive. These answers seem incorrect because they are based on theoretical drive performance ONLY. Ignacio Vazquez-Abrams Ignacio Vazquez-Abrams k 8 8 gold badges silver badges bronze badges.

And as always, RAID is not a replacement for a proper off-site backup plan. And zynga games RAID does not replace a backup surviving one disk failure is plenty to click you over till 5 PM, at which point people leave the office and you do emergence maintenance.

RAID5 uses one parity stripe. If one physical disk fails, the data from the failed disk can be rebuilt onto a replacement disk.

Now because drive failure is not a Poisson distribution due to the heavy loads on the drive during rebuild, a failure of a second drive is more likely to occur during this period, and the distribution is closer to a Gamma distribution with slightly higher values after a failure occurs.

Sign up to join this community. Raid 5 is slower writing and really slow when rebuilding. The best answers are voted up and rise to the top. Always also have an adequate backup and test recovery. When a failed disk is replaced, the replacement becomes the new hot spare.

Joel Coehoorn Joel Coehoorn 27k 12 12 gold badges 79 79 silver badges bronze badges. It's debatable which one is safer 6 vs See here for a detailed explanation of why RAID5 is the worst possible choice. Sign up using Facebook. In real life - the raid 6 wins.

Should i have a hot spare Spillett David Spillett A single drive in a single machine, probably not. It only takes a minute to sign up. Once an array is up for more than 30 days, it tends to last for years. In most cases 10 is both faster and more redundant at the cost of some disk space.

Financially, not quite as much. It can happen I've seen it! Using the mean time between failure MTBF for the drives, the probability of two drives failing one right after another or at the same time is about 0.

At least four disks are required. Disks from the same run have the exact same firmware and probably very similiar physical properties.

Active Oldest Votes. No data is lost in the case of a single disk failure, but if a second disk fails before the system can rebuild data to the hot spare, all data in the array will be lost.

RAID 6 provides for faster rebuilding of data from a failed disk. If safety is your main concern then go with RAID6 as it can survive any two drives failing at the same time.

That's how scary RAID5 is. Have should i have a hot spare considered 10? RAID5 has its uses. And when would "Raid 6" be optimal"? Is "Raid 6" always better? I can't tell the difference. If the data is critical, you should be backing it up and testing your recovery process.

Whatever you end up doing, only raid with a raid controller, not with the on-board soft controller that comes with your mobo.

Asked 9 years, 7 months ago. I disagree. I have also learned that Raid 6 drives are used thus tested right way and drives that fail tend to fail very quickly.

Also see here for a list of reasonable RAID choices by number of drives. This Best computer blackjack mode can support up to two disk failures with no data loss.

The hot spare can be powered down until needed, which means that it doesn't use power and incurs no wear. Ask Question. Updated the answer. However, reading cannot be 'faked' sped up with a cache unless the same data has recently or habitually already been loaded.

You should i have a hot spare safely lose any two drives, although it is a rare occurrence to lose two together short of severe physical trauma to the system.

RAID5 is never the best choice, ever. If one physical disk fails, the data should i have a hot spare available because it is read from the parity blocks. In conclusion, Raid 5 writing is slow but hidden with a good controller and that makes raid 5 or 6 basically the same with 'perceived' performance in writing there are some exceptions.

For a mostly read application such as should i have a hot spare web server, it makes no difference and you should use RAID6.

Email Required, but never shown. Edit: What to choose This also depends on the performance requirements of the server and the tolerable risk. Featured on Meta.

However, Raid 5 is slower reading than raid 6 and that will not be improved with a controller unless the data has already been loaded or an algorithm keeps a record of repeated reads. The manual dumbs down the different raid with 5 star ratings. Speaking strictly from a data integrity viewpoint, yes. If I were to blindly trust the manual I would conclude that "Raid 6" is always better. The Overflow Blog. Sign up using Email and Password. RAID10 should be the default choice if you care about your data meaning you depend on it, for example, to keep your business going. RAID10 will always perform better. People come here to get the best answer, and people should leave here knowing that RAID5 is always less than the best.