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fstrim and Luks / dm-raid


I've got a computer with 3 SSD in RAID5 (dm-raid) containing a LUKS
partition, then a lvm

Is fstrim useful in suc a case ? Or on mylaptop without the raid, but
with LUKS and LVM ?

Should I add the discard option in fstab ? Or an equivalent in
mdadm.conf or cryptsetup.conf ?


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