Date: Thu, 18 Sep 2008 22:48:03 +0100 From: Dieter <freebsd@sopwith.solgatos.com> To: freebsd-hardware@freebsd.org Subject: Re: Test: HighPoint RocketRaid 3120 PCIex1 2xSATA controller under FreeBSD 7.1-PRERELEASE Message-ID: <200809190548.FAA08998@sopwith.solgatos.com> In-Reply-To: Your message of "Fri, 19 Sep 2008 05:29:06 %2B0200." <48D31C82.8030007@fluffles.net>
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> If you get about the same scores with dd, try using a higher read-ahead > (vfs.read_max value, set it to 32 for example). Also sometimes it's > required to use a higher blocksize to get full potential, try: > > newfs -U -b 32768 /dev/<raid device> > > Warning: using 64KiB blocksize you risk hanging the system under heavy > load (like 2 bonnies running simultaniously). What's this about 64KiB blocksize hanging the system? Hang awhile then recover, or hang forever need a reboot? Is this a RAID thing or are normal disks at risk? It isn't obvious why a 64KiB blocksize would cause a problem in this day of multi GiB memory.
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