Ragnar Sundblad <ra...@csc.kth.se> wrote:
> On 1 jan 2010, at 17.28, David Magda wrote:
> > Don't really see how things are either hardware specific or dependent.
>
> The inner workings of a SSD flash drive is pretty hardware (or
> rather vendor) specific, and it may not be a good idea to move
> any knowledge about that to the file system layer.
If ZFS likes to keep SSDs fast even after it was in use for a while, then
even ZFS would need to tell the SSD which sectors are no longer in use.
Such a mode may cause a noticable performance loss as ZFS for this reason
may need to traverse freed outdated data trees but it will help the SSD
to erase the needed space in advance.
Jörg
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