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K380 Disappearing DVD or Disk Drive.

 
Brian Rich_1
Advisor

K380 Disappearing DVD or Disk Drive.

I have successfully loaded hp-ux 10.20 onto one k380. There are three drives in the system, one 9GB (system disk), and two 18GB data drives. Once the system is booted up and I view the drives through SAM, one of the drives has shown up as having 0MB. The DVD drive is there sometimes but not others. And lastly, in a separate machine, the 9GB drive has disappeared and everything else shows up. I am totally lost (which is nothing new if you read my other posts). Any help would be greatly appreciated!!
10 REPLIES 10
Brian Rich_1
Advisor

Re: K380 Disappearing DVD or Disk Drive.

I forgot to mention that I have made sure that they all devices have a different scsi id set and been seated properly.
Jeff Schussele
Honored Contributor

Re: K380 Disappearing DVD or Disk Drive.

Hi Brian,

Sure sounds like a SCSI subsystem problem of *some* sort. Make sure termination is proper & *only* at the ends of the chains. You may also want to try a different SCIS cable.

Rgds,
Jeff
PERSEVERANCE -- Remember, whatever does not kill you only makes you stronger!
A. Clay Stephenson
Acclaimed Contributor

Re: K380 Disappearing DVD or Disk Drive.

Poor termination can cause exactly this sort of problem. Things will almost work perfectly.
1) Make sure that you have the correct type of terminator. For example, a SE-SCSI terminator can physically plug onto a FWD/HVD SCSI connector. The connectors are the same but the terminators, along with are other devices, must be wither all SE-SCSI or all HVD SCSI.
2) Make sure that you have exactly two terminators on the physical ends of each bus. Often the terminators are built into the controllers. Make sure that the resistor packs are inserted (if this applies to your controller).
3) At least one device per bus must supply power for termination.
4) Do not exceed the maximum bus length applicable to your SCSI topology.

The "here now, gone again" scenario is very typical of poor termination.

If it ain't broke, I can fix that.
Brian Rich_1
Advisor

Re: K380 Disappearing DVD or Disk Drive.

If I am understanding you two correctly the cables themselves should have terminators on the end of them. I have checked all of the cables and both the Narrow DVD cable and the FWD cable has termination. The weird part about this is that the system saw everything when only the first and third drive were connected but when the second drive was connected the DVD and Tape drive would disappear. We unplug the middle drive again and again it sees the DVD. Could it have anything to do with the type of drives that we are using? We are using both 9GB WC/WD and 18GB WC/WD seagate drives with a converter attached on the ends. I have attached a pic of the back of the disk tray.
A. Clay Stephenson
Acclaimed Contributor

Re: K380 Disappearing DVD or Disk Drive.

It's a little difficult to follow all of this but you should note that the DVD (I assume that it is replacing the CD-ROM) should be on the SE-SCSI bus. Nothing on that bus should have any effect upon the FWD bus. Because you have indicated that the cables have terminators on them, it is now necessary to make certain that none of the drives are terminated. Also, if not external devices are connected to the FWD bus (this bus has an unterminated controller in the middle with one end going to the internal FWD bay and the other end is an external connector) then you must install a FWD terminator on this connector. It soulds as though youy may be trying to install a SE/LVD SCSI device on the FWD bus OR you are putting a terminated device in the middle of an already terminated bus. It is perfectly legal to terminate on the last device on a bus provided that the bus ends in a simple plug rather than a terminator. Finally, the integral terminators on the cables have been known to fail.

Some ioscan -fn's posted showing your various problems might be helpful.
If it ain't broke, I can fix that.