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On Mon, Nov 21, 2005 at 09:31:14PM +0100, Lars Roland wrote: > I have created a stripe across two 500Gb disks located on separate IDE > channels using: > > mdadm -Cv /dev/md0 -c32 -n2 -l0 /dev/hdb /dev/hdd > > the performance is awful on both kernel 2.6.12.5 and 2.6.14.2 (even > with hdparm and blockdev tuning), both bonnie++ and hdparm (included > below) shows a single disk operating faster than the stripe: > To rule out hardware problems (harware not as parallel as you might think): Try running the performance test (bonnie++ or hdparm) on both /dev/hdb and /dev/hdd at the same time. Two hdparms on different disks should not take longer time than one, unless you have bad hardware. One bonnie with size x MB takes y minutes to run. Two bonnies, each of size x/2 MB should take between y/2 an y minutes to run. If they need more, then something is wrong again, explaining bad RAID performance. Helge Hafting - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/ | ||||||||||
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