zfs discuss - Jun 2008 - ZFS Deferred Frees

I''m doing some simple testing of ZFS block reuse and was wondering when
deferred frees kick in. Is it on some sort of timer to ensure data 
consistency? Does an other routine call it? Would something as simple as 
sync(1M) get the free block list written out so future allocations could 
use the space?

... or am I way off in the weeds? :)

When a block is freed as part of transaction group N, it can be reused
in transaction group N+1.  There''s at most a one-txg (few-second)
delay.

Jeff

On Mon, Jun 16, 2008 at 01:02:53PM -0400, Torrey McMahon
wrote:
> I''m doing some simple testing of ZFS block reuse and was wondering
when
> deferred frees kick in. Is it on some sort of timer to ensure data 
> consistency? Does an other routine call it? Would something as simple as 
> sync(1M) get the free block list written out so future allocations could 
> use the space?
> 
> ... or am I way off in the weeds? :)
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