Date: Thu, 9 May 2013 10:00:29 -0500 From: Dan Nelson <dnelson@allantgroup.com> To: Benjamin Adams <benjamindadams@gmail.com> Cc: freebsd-stable@freebsd.org Subject: Re: recommended memory for zfs Message-ID: <20130509150029.GA20797@dan.emsphone.com> In-Reply-To: <518BA237.3030700@gmail.com> References: <518BA237.3030700@gmail.com>
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In the last episode (May 09), Benjamin Adams said: > Hello zfs question about memory. > I heard zfs is very ram hungry. > Service looking to run: > - nginx > - postgres > - php-fpm > - python > > I have a machine with two quad core cpus but only 4 G Memory > > I'm looking to buy more ram now. > What would be the recommend amount of memory for zfs across 6 drives on > this setup? As much as is reasonable to purchase. Postgres would probably appreciate the memory more than ZFS. You can run ZFS on memory-limited machines (I've gone as far down as 256MB), but the critical part is running a 64-bit kernel. ZFS does a lot of kernel malloc/free operations, and address space fragmentation on a 32-bit system will eventually cause a panic when ZFS can't malloc a contiguous 128k chunk. -- Dan Nelson dnelson@allantgroup.com
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