Date: Wed, 8 Feb 2012 10:40:45 -0800 From: Freddie Cash <fjwcash@gmail.com> To: "Eugene M. Zheganin" <emz@norma.perm.ru> Cc: freebsd-stable <freebsd-stable@freebsd.org> Subject: Re: zfs arc and amount of wired memory Message-ID: <CAOjFWZ5R8AjOc_KJ1tMyX=UKB6um2NDHnMM5jW3N5tWhOqAtdg@mail.gmail.com> In-Reply-To: <CAOjFWZ4Wefmxk5uTmhxJr13jwSe_jshFzJu0LTGyys7Mbo82Dg@mail.gmail.com> References: <4F30E284.8080905@norma.perm.ru> <4F310115.3070507@FreeBSD.org> <4F310C5A.6070400@norma.perm.ru> <4F310E75.7090301@FreeBSD.org> <4F3144A9.2000505@norma.perm.ru> <4F314892.50806@FreeBSD.org> <4F314B5B.100@norma.perm.ru> <4F3186C6.8000904@FreeBSD.org> <4F324F10.2060508@norma.perm.ru> <20120208131537.00004c01@unknown> <4F32BE0B.7000703@norma.perm.ru> <CAOjFWZ4Wefmxk5uTmhxJr13jwSe_jshFzJu0LTGyys7Mbo82Dg@mail.gmail.com>
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On Wed, Feb 8, 2012 at 10:40 AM, Freddie Cash <fjwcash@gmail.com> wrote: > On Wed, Feb 8, 2012 at 10:25 AM, Eugene M. Zheganin <emz@norma.perm.ru> w= rote: >> On 08.02.2012 18:15, Alexander Leidinger wrote: >>> I can't remember to have seen any mention of SWAP on ZFS being safe >>> now. So if nobody can provide a reference to a place which tells that >>> the problems with SWAP on ZFS are fixed: >>> =C2=A01. do not use SWAP on ZFS >>> =C2=A02. see 1. >>> =C2=A03. check if you see the same problem without SWAP on ZFS (btw. se= e 1.) >>> >> So, if a swap have to be used, and, it has to be backed up with somethin= g >> like gmirror so it won't come down with one of the disks, there's no nee= d to >> use zfs for system. >> >> This makes zfs only useful in cases where you need to store something on= a >> couple+ of terabytes, still having OS on ufs. Occam's razor and so on. > > Or, you plug a USB stick into the back (or even inside the case as a > lot of mobos have internal USB connectors now) and use that for swap. That also works well for adding L2ARC (cache) to the ZFS pool as well. --=20 Freddie Cash fjwcash@gmail.com
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