Bob Friesenhahn <bfrie...@simple.dallas.tx.us> wrote:
> On Sun, 11 Apr 2010, James Van Artsdalen wrote:
>
> > OpenSolaris needs support for the TRIM command for SSDs. This
> > command is issued to an SSD to indicate that a block is no longer in
> > use and the SSD may erase it in preparation for future writes.
>
> There does not seem to be very much `need' since there are other ways
> that a SSD can know that a block is no longer in use so it can be
> erased. In fact, ZFS already uses an algorithm (COW) which is
> friendly for SSDs.
Could you please explain what "other ways" you have in mind and how they work?
Jörg
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