 | | | HDIO_SET_DMA failed: Operation not permitted | HDIO_SET_DMA failed: Operation not permitted 2006-01-27 - By Rick Stevens
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On Fri, 2006-01-27 at 16:42 -0800, Biswajit Nayak wrote:
> Hi Experts,
> I want to enable the DMA on my linux server. I got
> the following error "HDIO_SET_DMA failed: Operation
> not permitted ". Any take on this ?
>
> [root@(protected) ocsperf]# /sbin/hdparm -d1 /dev/hda
>
> /dev/hda:
> setting using_dma to 1 (on)
> HDIO_SET_DMA failed: Operation not permitted
> using_dma = 0 (off)
> [root@(protected) ocsperf]#
Did you boot the system with "nodma" set? Check the output of
"cat /proc/cmdline" to see. If you did, you'll have to reboot the
system WITHOUT that option.
It's also possible that your controller (or drive) doesn't permit DMA.
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