Slow Hard Disk performance and High Cpu Usage

[oober]

I have a IDE and SATA drive installed and I'm not getting the proper performance out of these drives.

The performance tests I ran all show normal performance but when I copy a large file(350MB) from one disk to the other I only get about 35MB/s
and the CPU usage jumps up to about 80-90%.

Here is some info.

hdparm -tT /dev/hda

/dev/hda:
Timing cached reads: 3860 MB in 2.00 seconds = 1929.33 MB/sec
Timing buffered disk reads: 166 MB in 3.04 seconds = 54.69 MB/sec

hdparm -tT /dev/sda

/dev/sda:
Timing cached reads: 3812 MB in 2.00 seconds = 1905.34 MB/sec
HDIO_DRIVE_CMD(null) (wait for flush complete) failed: Inappropriate ioctl for device
Timing buffered disk reads: 186 MB in 3.00 seconds = 61.99 MB/sec
HDIO_DRIVE_CMD(null) (wait for flush complete) failed: Inappropriate ioctl for device

hdparm /dev/hda

/dev/hda:
multcount = 16 (on)
IO_support = 0 (default 16-bit)
unmaskirq = 0 (off)
using_dma = 1 (on)
keepsettings = 0 (off)
readonly = 0 (off)
readahead = 256 (on)
geometry = 16383/255/63, sectors = 120034123776, start = 0

hdparm /dev/sda

/dev/sda:
IO_support = 0 (default 16-bit)
readonly = 0 (off)
readahead = 256 (on)
geometry = 24321/255/63, sectors = 200049647616, start = 0

[adaptr]

I would at least enable 32-bit I/O on the IDE drive, and on the SCSI drive if it has that capability.
Also try copying a large file again when running dstat or vmstat - that will give you exact measurements on I/O.
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