Date: Tue, 20 Sep 2011 09:13:08 +0200 From: =?UTF-8?B?UmFkaW8gbcWCb2R5Y2ggYmFuZHl0w7N3?= <radiomlodychbandytow@o2.pl> To: freebsd-fs@freebsd.org Subject: Re: freebsd-fs Digest, Vol 431, Issue 2 Message-ID: <4E783D04.7000006@o2.pl> In-Reply-To: <20110919233058.463F01065711@hub.freebsd.org> References: <20110919233058.463F01065711@hub.freebsd.org>
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On 2011-09-20 01:30, freebsd-fs-request@freebsd.org wrote: > Presuming I can*find* a 112+ lane mobo, I assume the cost would be at worst double ($800ish instead of $400ish) a mobo with fewer pcie lanes... Good luck...I would be extremely surprised if you found it. And then even more surprised if it cost much below $8000. TYAN S8232, S7025 have 72 lanes, but unevenly distributed Supermicro X8OBN-F has 80, but that's for Xeon 7xxx. Tyan FT72B7015 has 8 x16 slots and 2 x4, but x16 ones are built with PCIe switches, which halves available bandwidth. I think having 8 SATA cards in them would be your best option. The only chance to have more would be something with 4 Opterons, but I haven't seen anything like that and I don't know if it's actually possible. Like pointed out, you'll also find scalability issues on the way in controllers, memory and likely in the OS too. Scalable Informatics build a system like this recently and after lots of tweaking they got 4.1 GB/s writes. http://scalability.org/?p=3355 However that was with Linux, XFS and a ton of tweaks made by people who do it for life. Overall, it reminds me about a song: https://www.youtube.com/watch?v=twICykaRRvY -- Twoje radio
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