Roch wrote:
Matthew Ahrens writes:
> Robert Milkowski wrote:
> > IIRC unmounting ZFS file system won't flush its caches - you've got to
> > export entire pool.
>
> That's correct. And I did ensure that the data was not cached before
> each of my tests.
Matt ?
It seems to me that (at least in the past) unmount would
actually cause the data to not be accessible (read would
issue an I/O) even if potentially the associated memory with
previous cached data was not quite reaped back to the OS.
Looks like you're right, we do (mostly) evict the data when a filesystem
is unmounted. The exception is if some of its cached data is being
shared with another filesystem (eg, via a clone fs), then that data will
not be evicted.
--matt
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