Proxmox Virtual Environment (VE) 9.0.5 – the ‚Discard‘ (also known as TRIM) option should generally be enabled for SSDs and thin provisioned LVM storage but it’s not enabled by default

The Discard option allows the hypervisor to inform the storage device when blocks of data are no longer in use improving performance and potentially extending the lifespan of SSDs. If you’re using thin provisioned LVM volumes the discard is essential for proper space reclamation

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