Re: [Nbd] write_zeroes/trim on the whole disk
> On 24 Sep 2016, at 17:52, Alex Bligh <alex@...872...> wrote:
>
> In *your* use-case holes may be desirable. However in the general case, you cannot assume a server supports holes. Optional support for holes isn't even in the mainline spec yet (AFAIR).
You should also be aware that the minimum granularity for writes (currently 1 byte in the spec, but the blocksize extension allows for larger) may be smaller than the minimum granularity for holes, which may depend on the underlying filing system.
A hole is in essence merely an optimised way of storing zeroes. And the trim operation says 'I'm not worried about this data any more - so zero it if you like'.
--
Alex Bligh
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