On Nov 18, 2009, at 8:54 PM, Duncan Bradey wrote:

Richard,

Thanks for this, this explains why I am seeing this. I am using snapshots as I am replicating the data to other servers (via zfs send/recieve) is there another way to prevent this behaviour and still use snapshots? Or do I need to create these volumes as thin provisioned to get around this?

IMHO, many volume use cases can be sparse.  For virtual machine disks, I
use sparse, compressed, and (soon) deduplicated volumes.
 -- richard

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