On 27/07/2011 11:22, Stan Hoeppner wrote:
On 7/27/2011 12:42 AM, Simon Matthews 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?
425 MB/s / 3 spindles = 142 MB/s per spindle
That's not poor, it's excellent. Which drives are these? WD Black,
Seagate, Hitachi?
Gentlemen, we've been round this loop before about 10 days ago. Pol's 20
MB/s was poor because he was testing on an array with unaligned
partitions and a resync was running, my 425 MB/s was a bad test because
it didn't use fdatasync or direct and I said dd was a bad test anyway,
etc etc.
Cheers,
John.
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