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Table of Contents
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Introduction
This section describes how to migrate your VAX system to CHARON-VAX. We will use a sample MicroVAX 3600 system to demonstrate the migration procedure. The process is similar for all CHARON-VAX models.
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If CHARON-VAX based virtual system needs to be created from scratch, refer to this Application Note describing how to find proper Qbus addresses and Vectors for each virtul device. |
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Creating CHARON Virtual Machine
As a first step it is required to create a CHARON Virtual Machine (VM) using the CHARON Virtual Machines Machine Manager in the following way:
Press the "Create VM from Template" button:
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Specify the HP VAX model to be emulated and the name of the VM then press the "Create" button:
The VM will be created:
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Select the VM from the left pane and press the "Edit Configuration" button:
The VM configuration file will be opened in Notepad. Now the file can be updated to reproduce the target HP VAX configuration.
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Collecting information about the source VAX system
The first step is to determine the exact configuration of your VAX hardware in order to create the CHARON VM configuration file.
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The source VAX configuration in this example is:
| Controller | Address | Devices on controller |
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| RQDX3 | 772150 | -DUA0 (RZ23) -DUA1 (RZ24) |
| RQDX3 | 760334 | -DUB2 (RZ25) -DUB3 (RZ26) |
| TQK50 | 774500 | -MUA0 (TK50) |
| TQK50 | 760444 | -MUB3 (TK50) |
| DHQ11 | 760520 | |
| DHQ11 | 760500 | |
| DESQA | 774440 | -XQA0 |
To find out the exact types of controllers please refer to the source VAX system documentation.
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Creation of CHARON-VAX configuration file
Using the above information, the following parameters and values can be set in the configuration file:
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The DESQA controller is mapped to a network interface having the name "Charon". This interface will be used for the CHARON VM (see the Installation section for more details) on this particular host.
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Making disk images
In our example, the mapping of the RQDX3 controller and the TQK50 tapes include physical devices and disk and tape images. The tape images have not to be manually created whereas the disk images have to be created as described below.
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Start the "MkDisk" utility by pressing the "Virtual Disk Tool" button in the "Host Information & Utilities" tab of the CHARON Virtual Machines Machine Manager:
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The following dialog will appear:
Select "VAX" in the "Select System" drop-down menu, "MSCP" in the "All Controllers" drop-down menu and "RZ24" (for example) in the "Select Disk Type" drop-down menu.
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Press then the "Create Disk Image" button:
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Repeat this sequence for the disks "RZ28.vdisk", "RZ22.vdisk" and "RZ23.vdisk". Place them in the same folder.
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Installation of VAX operating system
The next step is to transfer the data from the source VAX system to CHARON VM. The easiest way to do this is via backup over the network but for this operation a bootable network-enabled operating system on a CHARON-VAX disk image or physical disk is needed.
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Making remote backups
Now we are ready to create disk backups of the source VAX system on the CHARON VM.
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When the backup operation will be completed, the disk "DUA3" of the CHARON VM will contain 2 savesets: "DUA0.BCK" and "DUA1.BCK".
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Restore backups to CHARON-VAX disks
The savesets have now to be restored on their corresponding virtual disks. Login to the CHARON VM guest OS and issue this sequence of commands:
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The NIC can be disabled with a interface="(disabled)" statement in the CHARON VM configuration file.
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Alternative ways of data transfer
Some alternative methods of data transfer are also possible. For example:
- Connect a SCSI tape drive to the CHARON-VAX / CHARON-PDP host via a PCI card
- Map the tape drive in the CHARON VM configuration file
a. Restore the source VAX system backups from tape to disk images via VMS/RSX11/RT11 running on the CHARON VM
b. Boot from standalone backups and restore the content to the CHARON VM virtual disks - Dump the source VAX/PDP11 system backups to tape images using the "mtd" utility and:
a. Boot from the freshly installed VMS/RSX11/RT11 system and restore the tape images to the CHARON VM virtual disks
b. Boot from the standalone backup and restore the content to the CHARON VM virtual disks
- Map the tape drive in the CHARON VM configuration file
Create a network cluster between the source VAX/PDP11 system and the CHARON VM (it is possible to use the source system as a boot server); then perform simple backups from one disk to another:
$ BACKUP/IMAGE/IGNORE=INTERLOCK REAL$DUA0: DUA0:
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