Date: Tue, 13 Nov 2012 11:28:32 -0600 (CST) From: Bob Friesenhahn <bfriesen@simple.dallas.tx.us> To: Miroslav Lachman <000.fbsd@quip.cz> Cc: freebsd-fs@freebsd.org Subject: Re: RHEL to FreeBSD file server Message-ID: <alpine.GSO.2.01.1211131010100.14514@freddy.simplesystems.org> In-Reply-To: <50A26AA5.70806@quip.cz> References: <50A130B7.4080604@cse.yorku.ca> <alpine.GSO.2.01.1211122023240.19664@freddy.simplesystems.org> <50A2606D.3040306@cse.yorku.ca> <50A26AA5.70806@quip.cz>
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On Tue, 13 Nov 2012, Miroslav Lachman wrote: > Jason Keltz wrote: >> Thanks for your reply Bob! I've thought about adding more memory to the >> R720 which can go up to 768 GB. I'm just not quite sure how much we >> need, but it can never hurt to add more, I guess. I know you can never >> have too much memory!! :) > > Yes you can: > > http://www.zfsbuild.com/2012/03/02/when-is-enough-memory-too-much/ > http://www.zfsbuild.com/2012/03/05/when-is-enough-memory-too-much-part-2/ > > I don't know if the same problem exists on FreeBSD or not. The Solaris kernel and ZFS have a fairly intimate relationship regarding memory and ZFS is able to give up memory to the kernel on demand. FreeBSD does not have this intimate relationship. Regardless, code specific to ZFS likely behaves similarly. The behavior of semaphoring depends on CPU architecture and how many CPU cores are in the system. Bob -- Bob Friesenhahn bfriesen@simple.dallas.tx.us, http://www.simplesystems.org/users/bfriesen/ GraphicsMagick Maintainer, http://www.GraphicsMagick.org/
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