HDIO_SET_DMA failed: Operation not permitted

[Biswajit Nayak]

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 at localhost 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 at localhost ocsperf]#


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