Re: [LSF/MM TOPIC] Thin provisioning SOFT_THRESHOLD error handling

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On 1/29/13 3:14 AM, Hannes Reinecke wrote:
> Hi all,
> 
> Thin-provisioned devices have the ability to set a 'soft
> threshold', which is triggered if the real free space for this
> device is beyond this mark.
> 
> The intention behind this is to allow the system to induce some
> garbage collection with possibly freeing up unused space.
> 
> Initially it would be possible to execute garbage collection on 
> filesystems (eg for btrfs).
> 
> However, as this concept applies to other areas within the kernel 
> (like dm-thinp or even btrfs itself) it might be an idea to have a
> general mechanism / error handling etc in place.
> 
> I would like to discuss at LSF the possible implementations and
> handling mechanism for this kind of failure scenarios.

I'd be really interested in discussion on this as well. I can see a
bunch of different uses for this.

- -Jeff

- -- 
Jeff Mahoney
SUSE Labs
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