Date: Mon, 19 Sep 2011 11:52:19 -0700 (PDT) From: Jason Usher <jusher71@yahoo.com> To: freebsd-fs@freebsd.org Subject: Re: ZFS obn FreeBSD hardware model for 48 or 96 sata3 paths... Message-ID: <1316458339.73301.YahooMailClassic@web121216.mail.ne1.yahoo.com> In-Reply-To: <CAOeNLuprLpbMppZ_Wd47Ph_VDXbaEUd2r%2B1Fs%2B1XcJfx_AcNnw@mail.gmail.com>
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--- On Fri, 9/16/11, Rich <rincebrain@gmail.com> wrote: > 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. But does that exist ? I do not see any motherboards with even 64 lanes of pcie 2.0, much less 128 of them ... I'm seeing 32 @ pcie2.0 ... I guess 7 slots @ 16x would be 112 lanes, yes ? I just don't see a board like that in existence...
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