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On 01/19/2010 01:37 AM, Rodney Lindner wrote:
> Hi all,
> I was wondering, when blocks are freed as part COW process are the old blocks 
> put on the top or bottom of the freeblock list?
> 
> The question came about looking a thin provisioning using zfs  on top of 
> dynamically expanding disk images (VDI). If the free blocks are put at the end
> free block list, over time the VDI will grow to its maximum size before it 
> reuses any of the blocks.

Check the thread "Thin device support in ZFS?", from late december.

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