How does dm-thinp handle the our of space error?

How does dm-thinp handle the our of space error?

[Xie Gang]

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Hi,

The storage may run out of space and could not provision the space. So, how
does thinp handle such error since thinp is transparent to uper layer
filesystem?

Thanks,

-- 
Xie Gang

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Re: How does dm-thinp handle the our of space error?

[Heinz Mauelshagen]

On Wed, 2011-03-09 at 11:59 +0800, Xie Gang wrote:
> Hi,
>  
> The storage may run out of space and could not provision the space.
> So, how does thinp handle such error since thinp is transparent to
> uper layer filesystem?

It either postpones the bios until userspace has reacted growing the
pool _or_ it errors the ios depending on the related policy set.

This is defined by constructore parameter
 * 4: policy = "error|postpone":
 *             if pool runs full, bios will be errored or postponed
 *             (ie. application writes will stall)

Heinz

>  
> Thanks,
> 
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> Xie Gang
> 
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