On Mon, May 4, 2020 at 7:32 AM Void Star Nill <void.star.nill@xxxxxxxxx> wrote:
>
> Hello,
>
> I wanted to know if rbd will flush any writes in the page cache when a
> volume is "unmap"ed on the host, of if we need to flush explicitly using
> "sync" before unmap?
In effect, yes. rbd doesn't do it itself, but the block layer
does flush dirty data after making the disk unavailable for users
and before completely destroying it.
That said, it is always better to flush everything you need flushed
yourself. That way you are clear and explicit about your intent, can
log or react to errors, etc.
Thanks,
Ilya
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