On Sun, Jul 17, 2011 at 01:11:19PM +0100, John Robinson wrote: > On 17/07/2011 09:12, Pol Hallen wrote: > >hello and thanks for the reply :-) > > > >dd if=/dev/zero of=test bs=4096 count=262144 > >262144+0 records in > >262144+0 records out > >1073741824 bytes (1.1 GB) copied, 31.3475 s, 34.3 MB/s > > Pretty poor. CentOS 5, Intel ICH10, md RAID 6 over 5 7200rpm 1TB > drives, then LVM, then ext3: > # dd if=/dev/zero of=test bs=4096 count=262144 > 262144+0 records in > 262144+0 records out > 1073741824 bytes (1.1 GB) copied, 2.5253 seconds, 425 MB/s > > And there's a badblocks running on another drive also on the ICH10. > > Having said that, I think mine's wrong too, I don't think my array > can really manage that much throughput. We should both be using more > realistic benchmarking tools like bonnie++: Or simply pass the correct flags to dd — like oflag=direct, which will make it do non-buffered writes. regards, iustin -- To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
