Date: Thu, 09 May 2013 21:47:27 -0400 From: Benjamin Adams <benjamindadams@gmail.com> To: Shane Ambler <FreeBSD@ShaneWare.Biz> Cc: freebsd-stable@freebsd.org Subject: Re: recommended memory for zfs Message-ID: <518C51AF.5050609@gmail.com> In-Reply-To: <518C450B.5070809@ShaneWare.Biz> References: <518BA237.3030700@gmail.com> <518C450B.5070809@ShaneWare.Biz>
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On 05/09/2013 08:53 PM, Shane Ambler wrote: > On 09/05/2013 22:48, Benjamin Adams wrote: >> 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? >> > > I believe I heard a calculation of 1GB cache per 1TB of disk. But > basically zfs will use all free ram available if you access that much > data from disk. You will want to set vfs.zfs.arc_max to allow enough > ram for your apps to work in. > > If you consider the files for your website and the data you store you > may find that you would never fill more than 500MB of cache. > > If you will be serving large media files that will easily use up the > cache you could give them their own filesystem that only caches > metadata - zfs set primarycache=metadata zroot/mediafiles > > Thanks for all the replies Size of DB and HD's are: Current DB Size = 23 GB HD sizes = (6) 500 GB drives
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