Is overprovisioning still a must on these new SSDs? I have 2X 2TB Samsung 960 PROs in RAID 0.........is free space the same as overprovisioning or shall I still overprovision?
Is overprovisioning still a must on these new SSDs? I have 2X 2TB Samsung 960 PROs in RAID 0.........is free space the same as overprovisioning or shall I still overprovision?
For example, Samsung lets the user decide on how much space to leave for over-provisioning via the Samsung Magician tool.
It is advised to leave it at 10% (unless my memory fails me, pun intended), but ultimately you have control on the space reserved.
EDIT: It is probably very necessary to point out that there is another ~7% which is basic factory provisioning. Over-provisioning is used on top of that.
For example, Samsung lets the user decide on how much space to leave for over-provisioning via the Samsung Magician tool.
It is advised to leave it at 10% (unless my memory fails me, pun intended), but ultimately you have control on the space reserved.
EDIT: It is probably very necessary to point out that there is another ~7% which is basic factory provisioning. Over-provisioning is used on top of that.
True, manufacturer's software allows a user to change the amount of overprovisioning already set by the factory (the actual amount depending on manufacturer and the type of NAND used and its configuration. However, today's SSDs do not need to have that changed so it's best to leave it alone, the point I was trying to make.
Again, free space is not the same as overprovisioning and it is best to leave at least 20-25% off the total formatted capacity unused. You can get away with less but at the risk of slower performance and increased write amplification (the latter will also eventually reduce write life)..
True, manufacturer's software allows a user to change the amount of overprovisioning already set by the factory (the actual amount depending on manufacturer and the type of NAND used and its configuration. However, today's SSDs do not need to have that changed so it's best to leave it alone, the point I was trying to make.
Again, free space is not the same as overprovisioning and it is best to leave at least 20-25% off the total formatted capacity unused. You can get away with less but at the risk of slower performance and increased write amplification (the latter will also eventually reduce write life)..
then partition C: to 200 GB and D: to 3TB and leave the rest unpartitioned is that the correct way to overprovision a RAID 0 array? are the SSD controllers smart enough to know that unpartitioned space is for both SSDs and use it for both?
True, manufacturer's software allows a user to change the amount of overprovisioning already set by the factory (the actual amount depending on manufacturer and the type of NAND used and its configuration. However, today's SSDs do not need to have that changed so it's best to leave it alone, the point I was trying to make.
Again, free space is not the same as overprovisioning and it is best to leave at least 20-25% off the total formatted capacity unused. You can get away with less but at the risk of slower performance and increased write amplification (the latter will also eventually reduce write life)..
then partition C: to 200 GB and D: to 3TB and leave the rest unpartitioned is that the correct way to overprovision a RAID 0 array? are the SSD controllers smart enough to know that unpartitioned space is for both SSDs and use it for both?
I have no idea although I doubt it. Again, I do not recommend using RAID 0. With the exception of some MOBOs, such as some of the Intel MOBOs, TRIM will not work with RAID 0. The amount of speed gain you get from RAID 0 isn't enough to justify the increased risk of drive failure. Also, if you are trying to get a single directory, first, you don't really need one and second, you can achieve something similar using Windows Libraries.
Is overprovisioning still a must on these new SSDs? I have 2X 2TB Samsung 960 PROs in RAID 0.........is free space the same as overprovisioning or shall I still overprovision?
Have the storage controllers, drivers, and OS algorithms (or the much larger capacities that are available) changed significantly enough to have led to changes in the recommendations recommendations?
This Seagate paper doesn't answer that question, but it touches on some of the issues involved and also mentions their own data reduction technology, which they claim can help improve performance in a way different than through over-provisioning ("Note that additional over-provisioning and a data reduction technique such as DuraWrite technology can achieve similar write amplification results with different trade-offs. Benchmarking reveals that only drives with DuraWrite data reduction technology or something similar are able to take advantage of entropy-related write amplification reduction and the resulting performance improvements. Conventional SSDs without a similar technology are limited to the write amplification from a given over-provisioning level. As an example, a conventional SSD with 28% over-provisioning will exhibit the same write amplification (3.0) as an SSD with DuraWrite technology writing a 75% entropy stream with 0% over-provisioning, all other factors being equal.") http://www.seagate.com/tech-insights/ssd-over-provisioning-benefits-master-ti/
Is overprovisioning still a must on these new SSDs? I have 2X 2TB Samsung 960 PROs in RAID 0.........is free space the same as overprovisioning or shall I still overprovision?
Have the storage controllers, drivers, and OS algorithms (or the much larger capacities that are available) changed significantly enough to have led to changes in the recommendations recommendations?...
I just guessing that Samsung eliminated the ability to change the amount of overprovisioning to prevent people from reducing the amount. Also, just leaving enough free space (20-25%) will pretty much do the same thing as adding overprovisioning.
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