[OpenIndiana-discuss] Recommendations for fast storage

[Jay Heyl]

On Wed, Apr 17, 2013 at 11:21 AM, Jim Klimov <jimklimov at cos.ru> wrote:

> On 2013-04-17 20:09, Jay Heyl wrote:
>
>> reply. Unless the first device to answer returns garbage (something
>>> that doesn't match the expected checksum), other copies are not read
>>> as part of this request.
>>>
>>>
>> Ah, that makes much more sense. Thanks for the clarification. Now that you
>> put it that way I have to wonder how I ever came under the impression it
>> was any other way.
>>
>
>
> Well, there are different architectures, so some might do what you
> suggested. From what I read just yesterday, RAM mirroring on some
> high-end servers works indeed like you described - by reading both
> parts and comparing the results, testing ECC if needed, etc. to
> figure out the correct memory contents or return an error if both
> parts are faulty and can't be trusted (ECC mismatch on both).
>
> Military, nuclear and space systems often are built like 3 or 5
> computers (odd amount for easier quorum) doing the same calculations
> over same inputs, and comparing the results to be sure of them or to
> redo the task.
>
> So I guess it depends on your background - why you thought this of
> disk systems ;)


Actually, I'm pretty sure I read it somewhere on the internet. My fault for
thinking every guy with a blog actually knows what he's talking about. :-)