On Tue, 26 Jul 2011 22:42:14 -0700 Simon Matthews <simon.d.matthews@xxxxxxxxx> wrote: > On Sun, Jul 17, 2011 at 5:11 AM, John Robinson > <john.robinson@xxxxxxxxxxxxxxxx> wrote: > > > 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 > > What hard drive offers a sustained data rate of 425 MB/s or even half that? "md RAID 6 over 5 7200rpm 1TB drives" does? :) At least half that - easily. But still, the result posted is very much inflated, they forgot the "conv=fdatasync" option, so mostly benchmarking the FS cache in RAM. -- With respect, Roman
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