big flash disks?

Jörn Engel joern at logfs.org
Tue Jun 3 14:09:44 EDT 2008


On Mon, 2 June 2008 13:32:18 +0100, Jamie Lokier wrote:
> 
> If they can do 4k writes, and you cannot, it sounds like the SSDs you
> have used are very different to the SSDs they have used.  Is that
> right?

It isn't.  Their SSDs have shitty performance for 4k random writes.
That's the entire point of their product.  They reorder the data,
turning random 4k writes into aligned eraseblock-sized writes.  After
that reordering the performance goes way up.  Iirc at least one SSD they
used must have 1MB erasesize to explain the performance boost.

Jörn

-- 
Audacity augments courage; hesitation, fear.
-- Publilius Syrus



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