Date: Thu, 12 Feb 2009 11:57:02 +0000 From: Richard Tector <richardtector@thekeelecentre.com> To: Bradley Radjoo <Bradley.Radjoo@is.co.za> Cc: freebsd-performance@freebsd.org Subject: Re: Extremely slow write speeds to disk : FreeBSD 7.1 and Dell SAS 6/iR Adapter Message-ID: <49940E8E.1080107@thekeelecentre.com> In-Reply-To: <89D2AE9E4EAAB34FABDBF2913867C62F1CB4B133@ZABRYSVISEX04.af.didata.local> References: <89D2AE9E4EAAB34FABDBF2913867C62F1CB4B133@ZABRYSVISEX04.af.didata.local>
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Bradley Radjoo wrote: > Greetings, > > Please can you assist. > > I have attempted most of the popular BSD Variants such as NetBSD, Open > BSD, FreeBSD... > The only distrubution that seems to work on the is Dell SAS 6/iR Adapter > is FreeBSD 7.1 > Firmware version & date : 9/29/2008 00.25.47.00 > > But the issue is that writing to disk is extremely slow...i.e. 14Mb per > second.... > > If I install any other linux distribution, like CentOS, write speek is > the way it should be..it averages around 190Mb+ per second > > I was hoping if it were at all possible for you to assist me in with a > later RAID Controller Driver for the SAS 6/iR Adapter Try: hw.mpt.enable_sata_wc=1 in /boot/loader.conf and reboot. Assuming you are using SATA drives, the write cache is disabled by default. This reenables it. The mpt manpage holds more information. Regards, Richard
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