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The Question is: I have added a digital dat drive TLZ-09 in a storage works ssb. the disk array contains the system disk dka0: The system disk is on the internal scsi controller with cables to the ssb unit. I plugged in the tape drive on auto recogintion (default settings) I was expecting the drive to auto-detect. All disks are mounted in a cluster with $n$ defining the node number. I have a dlt tape drive in another node as MKB500: It didn't???? any idea's The Answer is : In order for OpenVMS to recognize a new device without rebooting, you must run the autoconfigure procedure. For OpenVMS Alpha, do this from a privileged account: $ run sys$system:sysman SYSMAN> io autoconfigure SYSMAN> exit From OpenVMS VAX, do this from a privileged account: $ run sys$system:sysgen SYSGEN> autoconfigure all Allocation classes for tape devices are set using the TAPE_ALLOCLASS system parameter. The ALLOCLASS system parameter applies only to disk devices. You set these parameters using the SYSGEN utility. If you have done the above, or have rebooted, and the device is still not recognized, it is possible that the SCSI bus is too long, that the SCSI bus is improperly terminated, that there is a SCSI ID unit number collision (with another SCSI widget or with the host controller(s) connected to the SCSI bus), or that there is a hardware problem with the SCSI device. Without additional system configuration information (which Alpha host, SCSI controller, multihost details, etc) it is not possible to say if there is a specific need for the use of allocation classes in this particular configuration -- the allocation classes are the "n" in the $n$ prefix. The allocation class prefix is typically only required when one or more multipath storage devices exists in the configuration, or when there is a need to differentiate two (or more) storage devices with identical unit numbers. With OpenVMS releases V7.1 later (V7.1-2 and later prefered), port allocation class support is available. Multihost SCSI configurations do not permit the configuration of tape or other "non-reentrant" devices on the shared SCSI bus. This configuration restriction is due to the results of the expected SCSI resets that can occur -- tape devices will rewind and reposition as expected as a result of a SCSI reset, triggering adverse effects on the host software accessing the tape device. Please contact your hardware support organization or Compaq Customer Services for assistance in configuring and troubleshooting the SCSI.
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