Date: Wed, 07 May 2014 02:25:47 +0200 From: Rolf Nielsen <rmg1970swe@gmail.com> To: freebsd-questions@freebsd.org Subject: Re: Swap on ZFS Message-ID: <53697D8B.2060906@gmail.com> In-Reply-To: <CAHAXwYA9NBsYTpUGCZ_5f%2B_qDuvS%2BbN9vE4GAZhpRhWVWCwi7g@mail.gmail.com> References: <CAHAXwYA9NBsYTpUGCZ_5f%2B_qDuvS%2BbN9vE4GAZhpRhWVWCwi7g@mail.gmail.com>
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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 On 2014-05-06 21:21, David Noel wrote: > Is swap on ZFS still ill-advised? All the forum, list, and blog > posts I find say it's a no-go. Is this still the case? The idea > behind it not working is that ZFS needs memory to write to disk, so > when you need to swap (are low on memory) ZFS won't be able to > write. > > I found some talk of having a tunable added as a workaround that > would reserve a certain amount of memory for ZFS so this wouldn't > be a problem, but have no idea if anyone's made any progress > towards implementing it. Just out of curiosity, why do you want it? To get swap on ZFS, you first need to create a ZFS filesystem on one or more devices, then you create a dedicated volume inside that filesystem and use that dedicated volume as swap. To me that seems to add unnecessary complexity, similar to using a file backed md device as swap. Please don't take this as criticism; you may very well have good reasons for wanting to do this. I'm just curious about those reasons. Rolf Nielsen -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.22 (FreeBSD) iQIcBAEBAgAGBQJTaX2LAAoJEB1OKfQ0M8Tg+zEQAMvhXbgl8/LE2s9ltfvfbnGe bMnBmYxMekQiZ14+n2467nP6z0OCr5AM/W53GxQ9ma2M9AkuU6WKr+srv1pe2eck cLnMA3EekiYLuDle5I2+Kc2NjZ/lVAVl379vYmzRGFbU2Uke2aZtgyQ9kUB+vrfl TeJ8QwmIDcCPELIDZJzI+WqLJZqDY2HfcWs5WtJkqqGf+27tYmS4aAFYWZQv7hFE K5Ps798LFQHshhAxqoWmOLbeeDhCSAsaOIMyIknPJ1I9xyXh2BDP16yRj37mw8Yk 7ca84uqQ5e0HJ6lhEU/RXc4kKuNKUDYZNB7d4jKNOBpDbx5irCJVAnAcdu/YD9G0 P7GpDd8RJR1EUmH32zTSmZnieoTtQNBcbxQo+pFVEi52yX6Q9GVwPkJfh4gjdiE/ 1JtWFhCSxGeBjjZlaTAntyA+YjRgiXM1cK3DbBeigc4LQtm4Ztoz2DsgxR70pE0x Fthliso+NSUZiz1rE9ep8Wc+4bIYzqfX+KI0PBz83V2ytpYEs1iNNm3au9sGyqib f6t2z1I0o8XO75CGlQjA1lEulKeY4cnpr948QCZMdKLzUd+DiyuF+qzZvOlGlQ3A QNz4/pSNXlZ48bK7R7C3u9xbRxqluJ58BUf3B6hu4wkgc6DqAWOxoWBGLck/dqfa XiUZqUred6DdnTzAXxXM =8BGL -----END PGP SIGNATURE-----
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