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According to the documentation, SSD TRIM/Discard support has been in DRBD since version 8. DRBD is supposed to detect if the underlying storage supports trim and, if so, automatically enable it. However, I am unable to TRIM my DRBD volumes.

[root@ha50a mysqld]# fstrim /ha
fstrim: /ha: the discard operation is not supported

It looks like DRBD disk is the only thing in the stack that does not have trim enabled...

[root@ha50a mysqld]# lsblk -D
NAME DISC-ALN DISC-GRAN DISC-MAX DISC-ZERO
sda 0 4K 2G 0
??sda1 0 4K 2G 0
??sda2 0 4K 2G 0
??sda3 0 4K 2G 0
??ha50a-root 0 4K 2G 0
??ha50a-swap 0 4K 2G 0
nvme4n1 0 512B 2T 0
nvme2n1 0 512B 2T 0
nvme0n1 0 512B 2T 0
??vg0-ha--001_00000 0 512B 2T 0
??drbd1000 0 0B 0B 0
nvme3n1 0 512B 2T 0
nvme1n1 0 512B 2T 0
nvme5n1 0 512B 2T 0

I can TRIM those drives when I don't have DRBD in the stack.

Any ideas?

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