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Data Progression Question

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Hey Guys,


So data progression works on the principle of 12 days down and 3 days up. Does data start progressing down at the end of the 12 days, so on the 13th day it will be eligible to be moved down to Tier 2? 

Does the 12 day cycle start again once its moved to Tier 2 so that it can then go into Tier 3, or once its started to tier down as long as its still stale it'll just keep moving down every data progression cycle till its sat on raid 6-10 tier 3?

Also the same for moving up, so after being accessed on the regular in tier 3, itll get moved to tier 2 on day 4s data progression cycle and could end up in Tier 1 again if needed, or will it never go back into Tier 1 again (as its just for writes?)

Cheers


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