From owner-freebsd-hackers Sun Sep 16 17:47:31 2001 Delivered-To: freebsd-hackers@freebsd.org Received: from smtp1.switch.aust.com (ussmbox.ozemail.com.au [203.108.63.250]) by hub.freebsd.org (Postfix) with ESMTP id D060B37B40A; Sun, 16 Sep 2001 17:47:02 -0700 (PDT) Received: from smtp2.switch.aust.com (IDENT:root@ras.wa [10.0.1.140] (may be forged)) by server1.ussbris (8.9.3/8.9.3) with ESMTP id MAA01316; Fri, 14 Sep 2001 12:04:53 +1000 X-Authentication-Warning: server1.ussbris: Host IDENT:root@ras.wa [10.0.1.140] (may be forged) claimed to be smtp2.switch.aust.com Received: from freebsd06.udt (nelsont@freebsd06.udt [10.0.2.56]) by smtp2.switch.aust.com (8.11.3/8.11.3) with SMTP id f8E2LXK25099; Fri, 14 Sep 2001 10:21:33 +0800 Received: by freebsd06.udt (sSMTP sendmail emulation); Fri, 14 Sep 2001 10:12:29 +0800 Date: Fri, 14 Sep 2001 10:12:29 +0800 From: Trent Nelson To: john_wilson100@excite.com Cc: Greg Lehey , freebsd-hackers@FreeBSD.ORG, sos@FreeBSD.ORG Subject: Re: Vinum Panic (was Re: HPT370 RAID or Vinum?) Message-ID: <20010914101229.G58338@freebsd06.udt> Mail-Followup-To: Trent Nelson , john_wilson100@excite.com, Greg Lehey , freebsd-hackers@FreeBSD.ORG, sos@FreeBSD.ORG References: <20775668.1000430889008.JavaMail.imail@doby.excite.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.2.5i In-Reply-To: <20775668.1000430889008.JavaMail.imail@doby.excite.com>; from john_wilson100@excite.com on Thu, Sep 13, 2001 at 06:28:02PM -0700 Sender: owner-freebsd-hackers@FreeBSD.ORG Precedence: bulk List-ID: List-Archive: (Web Archive) List-Help: (List Instructions) List-Subscribe: List-Unsubscribe: X-Loop: FreeBSD.ORG On Thu, Sep 13, 2001 at 06:28:02PM -0700, john_wilson100@excite.com wrote: > Well, I have to say that Vinum feels a lot faster than HPT RAID... I will > quantify this statement when someone tells me how to turn off ATA write > caching, because > > sysctl -w hw.ata.wc=0 > > doesn't work, says "sysctl: oid 'hw.ata.wc' is read only" # echo 'hw.ata.wc="1"' >> /boot/loader.conf Read-only sysctls have to be set here. On the note of write-caching - I was extremely surprised to notice how significant the performance increase is with it turned on. What used to take ~5 seconds to dump a 20-30MB core, now takes <1s. Regards, Trent. -- Trent Nelson - Software Engineer - nelsont@switch.aust.com "A man with unlimited enthusiasm can achieve almost anything." --unknown To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message