Update The 80% rule.md

jameskimmel · Dec 18, 2024 · fc50bc8 · fc50bc8
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+I don't know where this rule came from, but is bad and imprecise. 
 
+For HDD and blockstorage, performance will suffer if you fill your pool above 50%.  
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+For SSDs and blockstorage, fragmentation will not hinder performance that much, since there are no heads involved. Maybe you have some pseudo SLC cache that will suffer.
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+For HDD/SSD and datasets, there is no reason why you should not be able to fill up your 80TB pool with 79TB of data.