Re: thin provisioned LUN support

David Woodhouse
2008-11-06T15:24:04Z

On Thu, 6 Nov 2008, James Bottomley wrote:
> The way to do this properly would be to run a chequerboard of partials,
> but this would effectively have trim region tracking done in the block
> layer ... is this worth it?
>
> By the way, the latest (from 2 days ago) version of the Thin
> Provisioning proposal is here:
>
> http://www.t10.org/ftp/t10/document.08/08-149r4.pdf
>
> I skimmed it but don't see any update implying that trim might be
> ineffective if we align wrongly ... where is this?

I think we should be content to declare such devices 'broken'.

They have to keep track of individual sectors _anyway_, and dropping
information for small discard requests is just careless.

--
dwmw2