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Subject: [Bug 199189] SWAP on ZFS can crash server
Date: Wed, 15 Apr 2015 23:12:43 +0000
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=199189

Steven Hartland <smh@FreeBSD.org> changed:

           What    |Removed                     |Added
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                 CC|                            |smh@FreeBSD.org

--- Comment #2 from Steven Hartland <smh@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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