How many memory and ssd space are consumed by metadata of 2T caching ssd

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To: colyli@xxxxxxx
Subject: How many memory and ssd space are consumed by metadata of 2T caching ssd
From: Jianchao Wang <jianchao.wan9@xxxxxxxxx>
Date: Thu, 30 May 2019 11:22:21 +0800
Cc: linux-bcache@xxxxxxxxxxxxxxx
User-agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:67.0) Gecko/20100101 Thunderbird/67.0

Dear guys

We have an about 200T disk array and want to use a 2T ssd to cache it.
How many memory and ssd space are consumed by the bcache when the caching device
is nearly used up ?

Many thanks in advance
Jianchao

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