Hi! Correct me if I'm wrong, but isn't 40cm (about 16") the maximum cable length for EIDE cables? Especially for UDMA connections? That would explain that your drives work now. Ferdinand Mahr Am Mit, 09 Mai 2001 schrieb Olaf Hering:
What kernel do you use? I recommend the 2.4.2 kernel, the used CMD646 controller is broken and works only with 2.2.16 and 2.4.2.
Gruss Olaf
Until now I tried 2.2.16, 2.2.18 and 2.4.2! I got a hint from Jochen Hoffmann. He told me they had similar problems with two IBM DTLA-305040 (same family as mine) on AMD K7 computers running SuSE 6.4. Kernel update from 2.2.18 to 2.2.19 solved his problem and as a work around he turned off dma support. So I installed 2.2.18 and 2.4.2 but the error messages still occurred. Then I turned off UDMA of the DTLA-307030 and for the first time these kernel messages disappeared (with kernel 2.2.16 or 2.4.2). It must be a data transfer problem. After shortening the UltraATA cable from 24" to 12" I turned on again UDMA Mode 2. It works well since five hours. I only get a nfsserver failure during bootup with kernel 2.4.2: Starting kernel based NFS serverlockdsvc: Invalid argument .....failed and a few new kernel messages: May 9 19:46:46 MacHu8 inetd[395]: swat/tcp (2): bind: Address already in use May 9 19:47:37 MacHu8 /usr/sbin/gpm[637]: Error in protocol I'm not sure why this cable shortening works. Why should a longer cable support one UDMA/33 drive and another on the same cable won't work? And what about my CMD646? In which way is it broken? Regards, Micha
Am Don, 10 Mai 2001 schrieb MAHRF@de.ibm.com:
Hi!
Correct me if I'm wrong, but isn't 40cm (about 16") the maximum cable length for EIDE cables? Especially for UDMA connections? That would explain that your drives work now.
Ferdinand Mahr
You are absolutely right. That's the reason why I finally cut my cable to 12" which is the shortest length I could use in the B&W tower. I tried the long cable for various reasons. When you search the internet for linux, PPC and B&W G3 you will find Robert's Blue & White G3 page: http://linuxppc.org/hardware/blueg3/ where he discribes which equipment he's added to his B&W G3. He uses a "Maxtor 92732U8 connected through a standard 24" UltraATA 80-conductor IDE cable from Fry's". And I think he uses the 24" cable because of the same reason as I did: you cannot mount a second HD on top of the first one in a Rev.1 B&W tower. You have to place them next to each other. A ribbon cable has to be quite long for this purpose if you don't want it all scrunch. So I connected my first 30 GB drive (which was a WD) and the built in 6 GB drive with this 24" cable and they worked perfecly together for almost a year till the WD crashed. The really interesting thing for me was, that if you use two UDMA capable drives from the same manufacturer on the same cable, only one will work. But anyway you're right. Using an unspecified cable can lead to unexpected behaviour. Regards Micha
participants (2)
-
MAHRF＠de.ibm.com -
Michael Engel