Date: Wed, 09 Jul 2008 01:21:35 +0200 From: Kris Kennaway <kris@FreeBSD.org> To: Randy Bush <randy@psg.com> Cc: freebsd-fs@freebsd.org Subject: Re: Thinking of using ZFS/FBSD for a backup system Message-ID: <4873F67F.6050202@FreeBSD.org> In-Reply-To: <4873EE7C.6030207@psg.com> References: <bd9320b30807072315x105cf058tf9f952f0f5bb2a6a@mail.gmail.com> <20080708100701.57031cda@twoflower.in.publishing.hu> <bd9320b30807080131j5e0e02a4y3231d7bfa1738517@mail.gmail.com> <4873C4FA.2020004@FreeBSD.org> <4873E068.8060305@psg.com> <4873E0AE.6090305@psg.com> <bd9320b30807081531x4ba92c92lbcfcbeba059237af@mail.gmail.com> <4873ECE0.5090706@FreeBSD.org> <4873EE7C.6030207@psg.com>
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Randy Bush wrote: >>> vm.kmem_size=600M >>> vm.kmem_size_max=600M >>> vfs.zfs.prefetch_disable=1 >> Might be enough kmem > > and where is the 'nuf-a-mometer? The point at which it no longer panics from memory exhaustion ;) I've put no work into finding out exactly where this is, because my servers have gigabytes of memory and it is a performance optimization for me to set kmem as high as possible, which was previously just over 1500MB on amd64 but has now been increased in 8.0. Kris
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