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disk preallocation setting, what is posix_fallocate?

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i want to setup my stores to preallocate disks, that way they will not grow out of range like with thin provision. I have 40GB disks in vmware that are well over 2TB as they have just grown over time. So I want to avoid that.

There is an option for "Full" and also an option for "Full (posix_fallocate)". What is the 2nd one and which one should I be using? I don't want to use sparse files as those are weird and confusing to deal with I just want normal files that take up the space...

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