On 27/12/2010 19:02, Doug Dumitru wrote:
[...]

The same rules apply to most SSDs.  Most SSDs prefer 4K alignment
because of how the FTL (Flash Translation Layers) operate, even though
<4K will sometimes still work pretty well.

If I remember correctly, it may be better to align on SSDs at a larger 
granularity, to the SSDs' erase block size, which may be up to 512K 
depending on the SSD, though I don't remember at all how well Linux 
filesystems, VFS, block layer drivers etc. handle SSD TRIM etc.

Cheers,

John.