Kenneth Culver wrote:

but then why does read/write tests over raw devices performs so bad?
AFAIK on raw devices not filesystem, journaling, caches, etc are involved.

Like I said before, you might not have been testing the throughput of the disks,
instead you may have been testing the throughput of /dev/zero.

I woluld like to have the throughput of /dev/zero on my disks. :-)

# dd if=/dev/zero of=/dev/null bs=1024k count=1024 1024+0 records in 1024+0 records out 1073741824 bytes transferred in 3.414659 secs (314450672 bytes/sec)

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