From what I understand anytime that you but a slower device (in throughput) the ide interface with always default to the slower speed. Makes sense since if you had a udma33 and a udma100 device the 33 speed can't run at 100 but the 100 can run at 33. I've heard that one should put the cdroms on on ide ribbon and the hdd's on another. On Friday 03 January 2003 20:06, Carlos E. R. wrote:
The 03.01.02 at 19:47, David Herman wrote:
Thanks for your reply, I guess I will be trying Carlos' idea and place both hard drives on the same cable. I had hoped not to do this thinking that my swap partition would be faster on a seperate IDE chain (terminology?).
My original idea for separating them was because both HD support UDMA modes with the new thin ATA100 cable, bot not the CDwriter, so I assumed that mixing HD and writer on the same cable would slow down the HD.
So, hdparm reports udma5 for both my hard disks, and the slower udma2 for the CDwriter and DVD reader.
Alternately, is there some way to change the dvd player to IDE mode? Some way to turn ide-scsi off? It seems like this was how things worked on the box I removed the drive from.
I have the DVD with ide-scsi, and I can set dma on with hdparm, no problem:
nimrodel:~ # hdparm -d1 /dev/hdc
/dev/hdc: setting using_dma to 1 (on) using_dma = 1 (on)
Though it does complains a bit, after all hdparm acceses it the wrong way for an ide-scsi:
nimrodel:~ # hdparm /dev/hdc
/dev/hdc: HDIO_GET_MULTCOUNT failed: Input/output error IO_support = 0 (default 16-bit) unmaskirq = 0 (off) using_dma = 1 (on) keepsettings = 0 (off) readonly = 0 (off) BLKRAGET failed: Input/output error HDIO_GETGEO failed: Invalid argument
That might be different in your case, of course.
nimrodel:~ # hdparm /dev/hdc
Yast2 originally was able to find the dvd when it was linked to /dev/hdb, (It seems that yast2 approaches dvd's differently than is normal, ie no mount/umount when installing new packages from my dvd)
Yast mounts the dvd or cdrom on its own, and on a different directory than specified in fstab.
but I just tried browsing a cd with /media/dvd (directory) pointing to /dev/hdb (with the appropriate fstab entry) and had no luck
Well, if you have ide-scsi set, it wouldn't work that way.
-- Billboard Writer vs. Literature = Microsoft vs. Computing,