I just replaced my RedHat v7.3 installation with a clean install of RHL v9. Although I could enable DMA on 7.3, I now can't on the same hardware. DMA is not enabled automatically on this hard disk. OK. The problem is that I can't enable it with hdparm either (shown below). I have installed all the RH-released updates, including the kernel update. Can anyone suggest a remedy for this problem? Thanks. ------------------------- root@xxxxx root]# hdparm /dev/hda /dev/hda: multcount = 16 (on) IO_support = 0 (default 16-bit) unmaskirq = 1 (on) using_dma = 0 (off) keepsettings = 0 (off) readonly = 0 (off) readahead = 8 (on) geometry = 2584/240/63, sectors = 39070080, start = 0 [root@xxxxx root]# hdparm -d1 /dev/hda /dev/hda: setting using_dma to 1 (on) HDIO_SET_DMA failed: Operation not permitted using_dma = 0 (off)
