Date: Sat, 14 Feb 2009 08:29:53 +0100 From: Sebastiaan van Erk <sebster@sebster.com> To: Dieter <freebsd@sopwith.solgatos.com> Cc: freebsd-performance@freebsd.org Subject: Re: Extremely slow write speeds to disk : FreeBSD 7.1 and Dell SAS 6/iR Adapter Message-ID: <499672F1.4060109@sebster.com> In-Reply-To: <200902210616.GAA14352@sopwith.solgatos.com> References: <200902210616.GAA14352@sopwith.solgatos.com>
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This is a cryptographically signed message in MIME format. --------------ms090808020805040708000804 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Dieter wrote: >>> 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. >> > > Just keep in mind that turning the disk's write cache on puts your > data at risk. :-( > > The correct solution is NCQ. Just wondering, if you have a battery on your RAID array, is this a problem? Wouldn't the cache get written anyway in case of a crash? 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