Date: Wed, 09 Jul 2008 01:14:49 +0200 From: Kris Kennaway <kris@FreeBSD.org> To: CZUCZY Gergely <phoemix@harmless.hu> Cc: freebsd-fs@freebsd.org Subject: Re: Thinking of using ZFS/FBSD for a backup system Message-ID: <4873F4E9.3040203@FreeBSD.org> In-Reply-To: <20080708225449.1070252d@mort.in.publishing.hu> References: <bd9320b30807072315x105cf058tf9f952f0f5bb2a6a@mail.gmail.com> <20080708100701.57031cda@twoflower.in.publishing.hu> <bd9320b30807080131j5e0e02a4y3231d7bfa1738517@mail.gmail.com> <4873C4FA.2020004@FreeBSD.org> <20080708221327.5c1d0e92@mort.in.publishing.hu> <4873CF6C.7000205@FreeBSD.org> <20080708225449.1070252d@mort.in.publishing.hu>
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CZUCZY Gergely wrote: > On Tue, 08 Jul 2008 22:34:52 +0200 > Kris Kennaway <kris@FreeBSD.org> wrote: >>> I've finetuned ZFS as much as I could, I've read every little tiny >>> bit of hint/information/whatever that was available and I couldn't >>> get rid of those kmem_size panics in -RELEASE and -STABLE. >> Well, it's still almost certainly because you aren't setting >> kmem_size high enough. As you saw, that is the only thing I tuned >> (disabling prefetch is just for performance in my environment). >> >> If you can't set it high enough because you don't have enough RAM, >> that means your system does't have enough RAM to run ZFS, not that >> ZFS is unstable. > I've had a box with 2GB of memory for it, and around 5-6 filesystems. > I've set kmem_size as large as it was allowed, not a bit smaller. > > Where's the guide showing how much memory should I have for a setup? > How can "enough memory" be determined for a setup, without having > panics? I don't know; empirically my setup is an upper bound. How large was "as large as it was allowed" for you? Kris
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