On Tue, Apr 20, 2010 at 03:01:58PM -0500, Marco Peereboom wrote:
quoted text
> On Tue, Apr 20, 2010 at 03:48:23PM -0400, Ted Unangst wrote:
> > On Tue, Apr 20, 2010 at 3:11 PM, Marco Peereboom <slash@peereboom.us> wrote:
> > >>> And no, TRIM isn't supported.
> > 
> > >> The problem is that we're copying the entire disk, so, as far as the disk
> > >> (i.e., SSDs) is aware, that disk is 100% full-- all blocks are marked as
> > >> used even if they're empty.  If I understand correctly, how the
> > >> controller handles block reallocation in this scenario depends how it is
> > 
> > > You are.  The whole not write so often is really really really
> > > uninteresting.
> > 
> > It's not about writing too often, it's about the performance hit doing
> > a read/modify/write when there's no free blocks.  Like the 4k sector
> > problem, but potentially even worse.
> > 
> > On the other hand, it depends on how much writing your server will do
> > in service.  If you aren't writing large files, you won't notice much
> > difference, and the benefit of ultra fast random access is more than
> > worth it.
> 
> I am 100% unconvinced.

I *was* 100% unconvinced.  I am much better educated now.  Yes this
could be neat :-)