Date: Sat, 17 Sep 2011 01:45:50 -0400 From: Rich <rincebrain@gmail.com> To: Julian Elischer <julian@freebsd.org> Cc: Jason Usher <jusher71@yahoo.com>, "freebsd-fs@freebsd.org" <freebsd-fs@freebsd.org> Subject: Re: ZFS obn FreeBSD hardware model for 48 or 96 sata3 paths... Message-ID: <CAOeNLuprLpbMppZ_Wd47Ph_VDXbaEUd2r%2B1Fs%2B1XcJfx_AcNnw@mail.gmail.com> In-Reply-To: <4E742E5C.2010900@freebsd.org> References: <1316222526.31565.YahooMailNeo@web121205.mail.ne1.yahoo.com> <CAHcKe7kfdirJL-vPw=pnFvtzo7ZouDQNPkLVbKs_s35Amz40NQ@mail.gmail.com> <4E742E5C.2010900@freebsd.org>
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The 9201-16e or similar would do fine for 6 Gbit SAS rates if you don't want hardware RAID. To get full bandwidth SATA 3 from 48/96 drives, that's 750 MB/s * 8/10 (8 data bytes per 10 bytes transmitted raw - SATA 3 does an 8b10b encoding) ~ 600 MB/s * 48/96 = 28800/57600 MB/s PCIe 2.x is 500 MB/s per lane, so that's 57/114 lanes of PCIe 2.x to do full bandwidth. And that all assumes you have sufficient memory bandwidth anyway. - Rich
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