Do modern SSDs really need over-provisioning?
#1 Guest_AnonVendetta_*
Posted 30 May 2021 - 12:01 AM
If you dont know what OP is, it's basically unallocated free space on an SSD, usually at the end of the disk. SSDs use it for "trash pickup".
Lately I have been reading that modern SSDs dont really need this free space. The argument was that if you keep at least 10% free space within the volumes/partitions, then this should suffice just as well for this purpose, vs specifically reserving unallocated space as OP on the disk, that lives outside any partition.
I've always reserved 10% of my SSDs' overall capacity for OP. But this is unallocated space I cant use for anything else.
So...necessary, or not?
#2
Posted 30 May 2021 - 10:19 AM
Yes.
(the doubt may be on how much of it is needed).
BUT having 10% (or 15%, or whatever) kept free within a volume partition is a good idea to have filesystem efficiency but it has nothing in common with overprovisioning (which level needs to be properly set via - usually - the manufacturer tool, not just "some unused space at the end of the device").
There is a simple, nice document/white paper by Samsung that explains the effects (advantages and disadvantages) of overprovisioning (and how much is advised and why that much is advised):
https://www.samsung....White-paper.pdf
Of course the actual amounts may not be exact/correct for the specific type/brand/model of SSD.
Wonko
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