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There's no point in defragging an SSD unless the low-level controller is doing it; the controller is always presenting a false picture of the mapping between da

by dsr_ 4y ago

There's no point in defragging an SSD unless the low-level controller is doing it; the controller is always presenting a false picture of the mapping between data addresses and physical location of pages. There's no good ZFS defragging tool, although the initial send to a new pool will accomplish that. This is just a thing for COW-style filesystems.

Dylan16807 4y ago
> This is just a thing for COW-style filesystems. It doesn't have to be. ZFS in particular has an architecture that's very hostile to ever moving things. BTRFS has a design that's amenable to defragmentation, but the builtin option doesn't work with snapshots and the external programs I've tried are partial and finnicky.