Date: Mon, 23 Apr 2007 08:42:33 +0000 (UTC) From: "Bjoern A. Zeeb" <bzeeb-lists@lists.zabbadoz.net> To: freebsd-stable@freebsd.org Subject: Re: Dell SAS5 Performance Issue Message-ID: <20070423083849.H36917@maildrop.int.zabbadoz.net> In-Reply-To: <7579f7fb0704171048g357b8b19m8596b37c266009dd@mail.gmail.com> References: <460959E8.207@thekeelecentre.com> <eubm0p$bo7$1@sea.gmane.org> <46095CA9.7060701@thekeelecentre.com> <4624B4FE.1070402@tomjudge.com> <7579f7fb0704171048g357b8b19m8596b37c266009dd@mail.gmail.com>
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On Tue, 17 Apr 2007, Matthew Jacob wrote: Hi, >> Is there any news on the performance of this card? >> > > I personally have not been able to reproduce the problem. It seems to > occur whether in Integrated Raid or not. It seems to be related to > specific backplanes and drives. It's an important problem to solve I > agree. I had done some research a few weeks back and just found the reference again. There is a fujitsu-siemens manual[1], and 2.4.8 Disk write caching gives some hitns on why things are the way they are. I had also found references, that Windows people have effectively seen the same problem. My conclusion is - that's nothing that can be changes with software easily for the Dell PE 860 with that special chip. another 0.002ct References: [1] http://manuals.fujitsu-siemens.com/serverbooks/content/manuals/english/ir-sas-ug-en.pdf -- Bjoern A. Zeeb bzeeb at Zabbadoz dot NeT
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