SCSI Problem

[Atvar]

We have new SGI Tezro machines running IRIX here at work. They contain an Ultra 320 scsi card and are hooked up to a serial ATA to SCSI Jetstore RAID. No matter what, the OS doubles all the partitions and you have to go in and delete the "fake" partitions it finds and use the others. Thats fine. Doesn't cause a huge issue since it works fine after that.

The problem is whenever we daisy chain a DLT 4000 or 8000 drive to the raid, the machine won't boot. If we hook the Tezro up to the DLT drive and then the Raid to the DLT drive the machine will boot but all of the partitions show up 4 times and unmounts them and seems to want you to start from scratch. It also doesn't see the DLT drive at all. The DLT will work if it is the only thing on the chain.

I am wondering if its just because the DLT drive is slower than the raid. But I am wondering if there is something I have overlooked or a way to work around this.

Anyone ever have something like this happen?

Thanks

 

[Zepper]

Most tape drives are NOT LVD drives as are most hard drives these days - so tape should be hooked to a separate channel or an SE stub if your SCSI host adaper card has one (or its own SCSI adapter - might be best all around). And even when all the drives on a cable are SE, you would still have to make sure the termination is moved from where it is to past the tape drive if there are other drives in the string - there can be only ONE termination on a cable and it MUST be at the end of the cable. All others must be disabled or removed.
. Tape drives often have internal termination capability which should be disabled unless it is on its own channel off the controller. Also the SCSI ID number must be different from any other drive on the channel with it.

.bh.

 

[Atvar]

Thanks for the reply. Actually I got it working. The RAID had to be terminated. Never had to terminate any of our other raids externally but hey, whatever. It works