05-17-2006 01:42 AM
I'm testing a very old D Class (D230), with hp-ux 11.0.
There are 2 disks, and a CDROM. Everything is ok.
Now I'm addind some extra disks, an old scsi enclosure (hp6000 scsi se), with some disks.
The problem is so strange: when enclosure is powered on, the hardware path and special file of cdrom disappear, and is substituted by the same hwpath and special file that belong to one of the enclosure's disks.
What I've to do?
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05-17-2006 01:45 AM
You're probably on the same bus as the CD & one of the disks has the same SCSI ID.
You need to determine which one of the disks is using that ID & change it.
05-17-2006 01:47 AM
On the D-class machines the internal CD-ROM is on the same SCSI bus as the external SE-SCSI connector.
To solve the problem, change the SCSI ID on the disk in the enclosure that is causing the problem.
Also remember that on a SE bus, you can only have 8 devices, SCSI ID's 0 thru 7, and the controller takes up one of those IDs.
05-17-2006 01:55 AM
Those toggles are used to set the SCSI ID. For single-ended devices you will NOT use the toggle that is farthest left in each set of switches (that is the 8 bit, which does not apply to SE). The other 3 toggles are, from left to right, the 4 bit, 2 bit and 1 bit.
The toggles that are on control the SCSI id.
If all are off, then your ID is 0. If the 4-bit and 1-bit are on, then your ID is 5. If all 3 are on, your ID is 7.
To set the ID, first turn off the enclosure, set the ID, then turn the enclosure back on. Then try reattaching to your machine and see what shows up.
05-17-2006 01:59 AM
There is also the possibility that whoever set up the enclosure set up the disks to NOT use the switches on the back. In that case you will have to take the thing apart and check the disks themselves. If that is the case, just take your time and try not to get frustrated. Those 6000 enclosures are a pain in the a** to work on.