Re: ssd optimised mode

[Dongjun Shin <djshin90@gmail.com>]

On Mon, Feb 23, 2009 at 11:33 AM, Dmitri Nikulin <dnikulin@gmail.com> wrote:
> On Mon, Feb 23, 2009 at 12:22 PM, Dongjun Shin <djshin90@gmail.com> wrote:
>> A well-designed SSD should survive power cycling and should provide atomicity
>> of flush operation regardless of the underlying flash operations. I don't expect
>> that users of SSD have different requirements about atomicity.
>
> Well that's my point, it "should" provide atomicity, but is this the
> case for consumer SSDs? It is certainly NOT the case for cheap
> USB-based flash media and AFAIK not for CF either.
>

AFAIK, all enterprise and consumer SSDs have atomicity requirements
because they're designed to replace the HDD without changes to the OS.

USB or any kind of flash-based cards have different requirements.
They're optimized for cost and the priority for the atomicity is low.
Moreover, they can be plugged out without prior notice to OS.

-- 
Dongjun