I tested block i/o speed. when i tested file i/o speed,
i/o speed was 17mb/sec.
At this point file size was 3.1Gb, and command was "time dd
if=/linux_tag/linux.dd of=/linux_tag/linux_file.dd bs=8192k".
but when i tested block i/o speed, i/o speed was about 3mb/sec.
command was "time dd if=/dev/sdd1 of=/linux_tag/linux1.dd bs=8192k"
last i binded block device to raw device. and i test raw device i/o
command was "time dd if=/dev/raw/raw1 of=/linux_tag/linux_raw.dd
i/o speed was about 10Mb/sec.
why i/o speed was different between block device and raw device?
Please anyone explain to me!!!!!