From owner-freebsd-fs@FreeBSD.ORG  Mon Apr  2 21:29:44 2012
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Subject: Re: Swap on ZFS / swap_pager: indefinite wait buffer
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This is what I found. I should be using zvol as swap not swap files on zfs.
https://blogs.oracle.com/jimlaurent/entry/faq_using_zfs_for_swap

Thanks for your pointer.

> IIRC swap on ZFS is generally a bad idea.
> Search web for bad stories.