What does TRIM/discard in RAID do ?

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To: linux-raid <linux-raid@xxxxxxxxxxxxxxx>
Subject: What does TRIM/discard in RAID do ?
From: Pascal Hambourg <pascal@xxxxxxxxxxxxxxx>
Date: Sun, 15 Jan 2023 13:00:17 +0100
Organization: Plouf !
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:102.0) Gecko/20100101 Thunderbird/102.6.0

Hello,

Linux RAID supports TRIM/discard, but what does it do exactly ?

Does it only pass-through TRIM/discard information to the underlyingdevices or can it also store information about which blocks containvalid data in the superblock metadata ?

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