From mboxrd@z Thu Jan 1 00:00:00 1970 From: Adam Radford Subject: RE: 3ware 7500-12, bad write speed Date: Mon, 14 Oct 2002 11:08:33 -0700 Sender: linux-raid-owner@vger.kernel.org Message-ID: Mime-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Return-path: To: "'raid@ddx.a2000.nu'" Cc: linux-raid@vger.kernel.org List-Id: linux-raid.ids You probably won't get any benefit of 3ware with software raid by changing max/min readahead, since md.c sets its own readahead. For the writes, try it and find out. -Adam -----Original Message----- From: raid@ddx.a2000.nu [mailto:raid@ddx.a2000.nu] Sent: Friday, October 11, 2002 3:05 PM To: Adam Radford Cc: linux-raid@vger.kernel.org Subject: RE: 3ware 7500-12, bad write speed On Thu, 10 Oct 2002, Adam Radford wrote: > Can you run the following commands, then re-run your 3ware benchmark and see > if the results change? > > echo "60" > /proc/sys/vm/bdflush > echo "512" > /proc/sys/vm/max-readahead > echo "256" > /proc/sys/vm/min-readahead Do any of this settings (or any other settings in /proc/sys/vm) help sw raid ? also what are the best parameters for mke2fs (both sw and hw raid) (i now run mke2fs -j -m 0 /dev/sdb1 (or /dev/md0) - To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html