Mixing IDE and IDE-SCSI emulation on a Channel

[Samuel Flory]

Reuben D. Budiardja wrote:
> Hi all,
> I recently put in a CD-RW drive in my system, and make it the master drive on 
> the secondary channel (hdc). The CD Rom drive that was already there becomes 
> the slave hdd.
> Following the CD-Writing-Howto, I finally figure out how to use 
> cdrecord/xcdroast and that I have to use the CD-RW as a SCSI device using the 
> ide-scsi emulation module (the Redhat doc in redhat site is horrible and not 
> helping by the way).
> 

    You sure you jumpered the 2 drive correctly

> But I still can't figure out how to play regular CD player, or rip a CD to mp3 
> using grip on that CD-RW drive, which acts as if it were a SCSI device. No 
> problem, I thought, I just use the other CD-rom drive. However, when ripping 
> a CD, I notice that the performance is kinda slower than usual. For example, 
> lame would have to sit idle waiting for the ripping to complete, when usually 
> the ripping of 1 CD would complete and lame would be behind like 75 % of 
> completion. 


    You should be able to use the cdrom that is in scsi emulation.  Are 
you attempting to use /dev/scd0?

> Another problem, I have found the CD-ROM device to generate errore like below, 
> 2 times after I installed the CD-RW:  
> 
> kernel: hdd: ATAPI reset complete
> kernel: hdd: irq timeout: status=0xd0 {Busy}
> kernel: hdd: irq timeout: error=0xd0LastFailedSense 0x0d
> 
> Once it makes the system hung intermittenly, it almost crashed the system. But 
> I managed to reboot and it seems that it fixed the problem (at least up till 
> now). I don't know if this just coincidence of has anything to do with the 
> newly installed CD-RW.
> 
> So, no real quantitative assesment yet (not sure how to do that),  but I am 
> wondering if mixing the IDE-SCSI simulated device (CD-RW) and IDE/ATAPi 
> device (CD-rom) in a single channel as Master and Slave would make my CD-ROM 
> slower and generate those problems.
> 


   No it's most likely due to the fact that you're using a master slave 
config.  What kernel rev are you running?  What settings do the 2 drives 
claim via hdparm? "hdparm -vi /dev/hdc /dev/hdd"?


-- 
Unless you can't avoid it never put a
serial number on any of your systems!!
(The Numberless Rule of Hardware Acquisition)
Sam Flory  <sflory at rackable.com>