> However, when I do > $ growisofs -Z /dev/scd0 -speed=8 -R -J treename > it takes the whole 44 minutes. The reported average speed is about 0.8x, > and the hard disk LED is not lit 1/3 to half the time. It seems like > image-making and burning are taking turns. > [...] I am using ide-scsi access for the burner. Besides Volker's idea about DMA i got a another suspicion : Is your burner at the same IDE controller as your source disk ? Is that fast other disk possibly at a different IDE controller ?
Yes, the burner is on a different IDE controller than the data disk.
I once experienced similar effects with a CD-Burner at hdb while its source disk was hda. Another effect was that hdastalled while hdb was blanking or fixating CDs. I swapped the burner with the second disk hdc and performance became acceptable (12x CD speed).
My burner is /dev/hdc (hdc=ide-scsi), and the data disk is /dev/hdb.
After i then enabled DMA by hdparm -d1 /dev/hdc (despite ide-scsi) even my screen cursor moved smoothely while burning CDs. :))
I cannot do that for some reason: # hdparm -d1 /dev/hdc /dev/hdc: setting using_dma to 1 (on) HDIO_SET_DMA failed: Operation not permitted using_dma = 0 (off) Any help would be greatly appreciated! Thanks, Alex -- Alexander Roitman http://ebner.neuroscience.umn.edu/people/alex.html Dept. of Neuroscience, Lions Research Building 2001 6th Street SE, Minneapolis, MN 55455 Tel (612) 625-7566 FAX (612) 626-9201
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