[Bug 199189] SWAP on ZFS can crash server

[bugzilla-noreply at freebsd.org]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=199189

Steven Hartland <smh at FreeBSD.org> changed:

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                 CC|                            |smh at FreeBSD.org

--- Comment #2 from Steven Hartland <smh at FreeBSD.org> ---
Without some serious work, swap on ZFS will be error prone as ZFS can require
memory to complete its IO pipeline and swap data to its vdevs so if memory is
really short it can easily cause a deadlock.

So while light use of swap on ZFS can work, heavy use of it will almost
certainly fail.

Given this I would never recommend ZFS backed swap.

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