🎰 Is it worth to make a RAID 1 plus 1 hot spare drive? - Super User

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Hot standby may have a slightly different connotation of being active but not productive to hot spare, that is it is a state rather than object. For example, in a national.


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Solved: RAID CONFIGURATION WITH HOT SPARE - Dell Community
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Which is better: RAID5 + 1 Hotspare / RAID6? - Server Fault
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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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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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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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Hot standby may have a slightly different connotation of being active but not productive to hot spare, that is it is a state rather than object. For example, in a national.


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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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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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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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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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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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Is "Raid 6" always better? Also see here for a list of reasonable RAID choices by number of drives. Disks from the same run have the exact same firmware and probably very similiar physical properties. In short: If safety is your main concern then go with RAID6 as it can survive any two drives failing at the same time. If your mobo goes out, you are asking for trouble. If I were to blindly trust the manual I would conclude that "Raid 6" is always better. Have you considered 10? Asked 9 years, 7 months ago. If you can do raid 6, you can do raid Trevor Trevor 19 1 1 bronze badge. Post as a guest Name. This Raid mode can support up to two disk failures with no data loss. How Stack Overflow hires engineers. For a mostly read application such as a web server, it makes no difference and you should use RAID6. 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 hot spare can be powered down until needed, which means that it doesn't use power and incurs no wear. RAID5 has its uses. And when would "Raid 6" be optimal"? Always also have an adequate backup and test recovery. 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. Raid 6 is better for read and is more tolerant 2 versus one drive. If safety is your main concern then go with RAID6 as it can survive any two drives failing at the same time. Active Oldest Votes. A hot spare is untested and may actually fail immediately right when its needed. The raid is being down by a hardware controller lol i have heard too many things against software raid controllers. In most cases 10 is both faster and more redundant at the cost of some disk space.

Super User is a question and answer site for computer enthusiasts and power users. These are the facts of the case, and they are undisputed by anyone who knows what should i have a hot spare are talking about :. Once an array is up for more than 30 days, it tends to last for years.

The manual dumbs down the different raid with 5 star ratings. 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.

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.

All RAID arrays eventually fail! Financially, not quite as much. Email Required, but never shown. 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.

I disagree. And as always, RAID is not a replacement for a proper off-site backup plan. Data from a failed disk is rebuilt onto the hot spare disk. I can't tell the difference. That's how scary RAID5 is. The Overflow Blog. Active 2 years, 6 months ago. 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 to join this community. When blackjack multiple players failed disk is replaced, the replacement becomes the new hot spare.

These answers seem incorrect because they are based on theoretical drive performance ONLY. In conclusion, Raid should i have a hot spare 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.

ServerFault has a good discussion on this. Sign up or log in Sign up using Google. Bombilious 31 2 2 bronze badges. However, reading cannot be 'faked' sped up with a cache unless the same data has recently or habitually already been loaded.

In real life - the raid 6 machine sous casino belgique a. And since RAID does not replace a backup surviving one disk failure is plenty to tide you over till 5 PM, at which point people leave the office and you do emergence maintenance.

However, Raid 6 reads faster and controllers wont likely help in a real life workload to improve read performance.

Viewed 45k times. Bombilious Dr. If you can afford the overhead, use RAID10 for highly disk-intensive applications. Edit: What to choose This also depends on the performance requirements of the server and the tolerable risk. I have should i have a hot spare learned that Raid 6 drives are used thus tested right way and drives that fail tend to fail very quickly.

If the servers' environment sports betting books to read pretty nice for hardware colo, climatized etc. You can safely lose any two drives, although it is a rare occurrence to lose two together short of severe physical trauma to the system.

David Spillett David Spillett A single drive in a single machine, probably not. Raid 5 should i have a hot spare slower writing and really slow when rebuilding. Updated the answer. Ignacio Vazquez-Abrams Ignacio Vazquez-Abrams k 8 8 gold badges silver badges bronze badges.

What is "Raid 6" excerpt from User Manual, Sect 4. Sign up using Facebook. The best answers are voted up and rise to the top. Whatever you end up should i have a hot spare, only raid should i have a hot spare a raid controller, not with the on-board soft controller that comes with your mobo.

RAID 6 provides for faster rebuilding of data from a failed disk. Featured on Meta.

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. RAID5 uses one parity stripe. 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. There is a big difference between theory and the real world when it comes to RAID5. For any RAID 5 or 6 you have to be carefull to use disks which are not from the same production run. There is a difference between "the best choice" and "the best choice you can afford". RAID10 should be the default choice if you care about your data meaning you depend on it, for example, to keep your business going. If the data is critical, you should be backing it up and testing your recovery process. Notice that in no case is RAID5 the best choice regardless of hotspare. Sign up using Email and Password. It can happen I've seen it! Two drives will fail one right after the other about every 8. At least four disks are required. If one physical disk fails, the data from the failed disk can be rebuilt onto a replacement disk. If one physical disk fails, the data remains available because it is read from the parity blocks. Speaking strictly from a data integrity viewpoint, yes. Joel Coehoorn Joel Coehoorn 27k 12 12 gold badges 79 79 silver badges bronze badges. If you have enough disks for raid 6, you've got enough to do a 10 volume. 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. RAID10 will always perform better. RAID5 is never the best choice, ever. If the environment makes it more likely that more than one disk fails within short time vibrations, humidity, dirt , then go for RAID 6. Ask Question. It only takes a minute to sign up. People come here to get the best answer, and people should leave here knowing that RAID5 is always less than the best.