this is what happened (also tried just -d1).
hdparm -d 1 -c 1 /dev/hda
/dev/hda: setting 32-bit IO_support flag to 1 setting using_dma to 1 (on) HDIO_SET_DMA failed: Operation not permitted IO_support = 1 (32-bit) using_dma = 0 (off)
Man this is tough...
Timo
Timo Railo wrote:Something is wacky. Any idea what could be causing such a poor performance. Quite new hardware, normal IDE, disks in separate BUSses.
tmoby:~# hdparm -T /dev/md0
hdparm -Tt /dev/hda /dev/hdc /dev/md0
/dev/hda: Timing buffer-cache reads: 1828 MB in 2.00 seconds = 914.00 MB/sec Timing buffered disk reads: 8 MB in 3.00 seconds = 2.67 MB/sec
/dev/hdc: Timing buffer-cache reads: 1864 MB in 2.00 seconds = 932.00 MB/sec Timing buffered disk reads: 10 MB in 3.69 seconds = 2.71 MB/sec
/dev/md0: Timing buffer-cache reads: 1864 MB in 2.00 seconds = 932.00 MB/sec Timing buffered disk reads: 10 MB in 3.63 seconds = 2.75 MB/sec
Cheers, Timo Railo
Check your hd settings via hdparm -i /dev/hda to see if dma is enabled. It's normally disabled so you'll have to enable it. hdparm -d1 /dev/hda to set it. Then adjust the hdparm script in /etc/init.d to enable this on startup or adjust your kernel to always set this automatically.
Regards, Benedict
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