On Sun, Aug 26, 2012 at 12:22:47AM +0200, Volker Armin Hemmann wrote:

> > > The size of an erasable block of SSDs is even larger, usually 512K, it
> > > would be best to align to that, too. A partition offset of 512K or 1M
> > > would avoid this.
> > 
> > Unless the filesystem knows this and starts bigger files at those 512 k
> > boundaries (so really only one erase cycle is needed for files <=512 k),
> > isn't this fairly superfluous?
> 
> no, if you misalign, a lot of 4k blocks might span into two erase blocks. 
> Which is bad. If you align correctly,  you will never cross them unnecessary, 
> sparing your SSD some unnecessary writes and improving overall performance. 

I don’t quite follow.  If you align to 4k, then you are also aligned to 512k,
because 512 % 4 = 0.
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