[Beowulf] Re: ECC support on motherboards?
joelja at bogus.com
Wed May 21 13:00:08 PDT 2008
Robert G. Brown wrote:
> On Wed, 21 May 2008, Eugen Leitl wrote:
>> On Wed, May 21, 2008 at 03:36:24PM +0100, Kozin, I (Igor) wrote:
>>>> b) Laptops. I'd REALLY like a flash-driven laptop.
>>> Who wouldn't? But what's the typical lifespan of flash memory?
>> Current SSDs claim >1 Mh MTBF, largely due to wear-leveling.
> A Mh is, lessee, 100 years? So one failure per hundred systems per
> year? Or if it is truly due to wear, perhaps it is zero failures per
> hundred systems for 50 years, then an increasing failure rate out to
> If it is wear, however, lifetimes may depend on usage, and using it as a
> root fs and/or home directory may significantly shorten lifetime.
given a 300,000 cycle rated life span, a solid wear-leveling algorithm,
and a controller that groups and shadows incomplete writes you can write
to a 16GB flash drive at 20MB/s for 9 years before it exceeding it's
warranted cycle life.
It used to be fairly trivial to exercise a given block until it failed,
but by in large that won't happen anymore.
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