Pros: » Fast and redundant. Cons: » Expensive because it requires four drives to get the capacity of two. Pros: » Reasonable value for the expense. Cons: » Requires a lot of drives. Size of array vs size of drives It is a little-known fact that you do not need to use all of your drive capacity when creating a RAID array. Rebuild times and large RAID arrays The more drives in the array, and the larger the HDDs in the array, the longer the rebuild time when a drive fails and is replaced or a hot-spare kicks in.
Fileservers, general storage servers, backup servers, streaming data, and other environments that call for good performance but best value for the money.
Similar to RAID 5, including fileservers, general storage servers, backup servers, etc. Ideal for database servers and any environment with many small random data writes. Good configuration for cases where many drives need to be in a single array but capacity is too large for RAID 10, such as in very large capacity servers.
RAID 60 is similar to RAID 50 but offers more redundancy, making it good for very large capacity servers, especially those that will not be backed up i. Pros Fast and inexpensive. All drive capacity is usable. Quick to set up. Highly redundant — each drive is a copy of the other. If one drive fails, the system continues as normal with no data loss. Redundant with better performance and capacity than RAID 1. Good value and good all around performance.
Reasonable value for money with good all-round performance. Can survive two drives failing at the same time, or one drive failing and then a second drive failing during the data rebuild. Fast and redundant. Reasonable value for the expense. Very good all-round performance, especially for streaming data, and very high capacity capabilities. Can sustain two drive failures per RAID 6 array within the set, so it is very safe. Cons RAID 0 provides no data protection at all.
If one drive fails, all data will be lost with no chance of recovery. Cost is high because only half the capacity of the physical drives is available. One drive capacity is lost to parity. Can only survive a single drive failure at any one time. If two drives fail at once, all data is lost. More expensive than RAID 5 due to the loss of two drive capacity to parity. Slightly slower than RAID 5 in most applications.
Expensive as it requires four drives to get the capacity of two. Not suited to large capacities due to cost restrictions. Not as fast as RAID 5 in streaming environments. Requires a lot of drives. Capacity of one drive in each RAID 5 set is lost to parity. Slightly more expensive than RAID 5 due to this lost capacity. Slightly more expensive than RAID 50 due to losing more drives to parity calculations.
Battery-back write back cache can dramatically increase performance without adding risk of data loss. Hard drives have the chance to fail up to 5. The answer is complicated. One of the problems when it comes to RAID 5 is that its difficult to understand.
Many articles bog down an already complex topic with dense terminology and complex calculations. This means that RAID has an array or a number of disks that are interpreted by the operating system as a single device.
And the redundancy feature means that the same information gets stored on each drive in the array providing extra insurance that information on each disk is safe. This means that even if multiple hard drives fail you will not suffer any data loss. There are many different RAID types that can fit any number of your personal or business needs from RAID 0 which does not offer data redundancy to RAID 10 which offers good performance with the tradeoff of available disk space. RAID 5 allows you to have the best of all worlds — it allows combining great data performance and safety with an affordable price.
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Visit our corporate site. All rights reserved. England and Wales company registration number Aren't you increasing the amount of lost storage significantly with each new volume? With a hot spare and monitoring you will have plenty of time to replace any bad drive once it bites the dust.
There is going to be a performance hit, but that is only if you have a dual channel raid controller that can hammer the throughput I'm more curious than anything. I suspect that the poster recommends no more than 3 because if you lose another disk or encounter disk errors of almost any kind during the rebuild, the entire array may be lost.
That's why I said below that it is preferable to keep the disk count as low as possible, while offering the necessary space. A 6 x 1TB raid5 array will be closer to 4. You're right. My bad. Thanks for the explanation. That's a very good reason. Chopper3 Chopper3 99k 9 9 gold badges silver badges bronze badges. You can lose UP TO half the disks.
If you lose two disks from the same mirror, you're SOL. Community Bot 1. Joe Joe 1, 15 15 silver badges 22 22 bronze badges.
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