I am going to rebuild my 8T sata disk. My system will be like:
/dev/sda1 - 600MB efi
/dev/sda2 - 400GB bcache
/dev/sda3 - 1G /boot
/dev/sda4 - 500GB btrfs for Silverblue/Kinoite
/dev/sdb1 - 600MB efi
/dev/sdb2 - 20GB for emergency OS
/dev/sdb3 - 8TB btrfs bcache backing partition
/dev/sdc1 - 6T btrfs (to receive btrfs send from /dev/sdb3)
Under normal situation, I will boot with my SSD (sda) and access sdb3 via bcache .
In emergency, I still want to access sdb3 when booted with /dev/sdb2 .
Wtih this setup, will btrfs dedup work transparently with out regarding to bcache?
=== Questions ===
Q1: with bcache, should I use 1 or 2 copy of metadata?
SSD: metadata 1 copy
HDD: metadata 2 copy
Q2: For compress mount options, should I use zstd:1 or zstd:5 ?