Date: Fri, 14 Sep 2001 10:12:29 +0800 From: Trent Nelson <nelsont@switch.aust.com> To: john_wilson100@excite.com Cc: Greg Lehey <grog@lemis.com>, freebsd-hackers@FreeBSD.ORG, sos@FreeBSD.ORG Subject: Re: Vinum Panic (was Re: HPT370 RAID or Vinum?) Message-ID: <20010914101229.G58338@freebsd06.udt> 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 References: <20775668.1000430889008.JavaMail.imail@doby.excite.com>
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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
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