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Table of Contents
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Introduction
This section describes how to migrate your VAX system to CHARONCharon-VAX. We will use a sample MicroVAX 3600 system to demonstrate the migration procedure. The process is similar for all CHARONall Charon-VAX models.
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If the CHARONCharon-VAX based virtual system needs to be created from scratch, refer to the appendix "Configuring devices on the Qbus of a VAX or CHARON-VAX" describing how to find proper Qbus addresses and Vectors for each virtual device. |
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Collecting information about the source VAX/VMS system
The first step is to determine the exact configuration of your VAX hardware in order to create the CHARONCharon-VAX configuration file.
Turn on your source VAX system. At the ">>>" prompt, issue the "show qbus" and "show device" commands:
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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 |
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Creation of
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Charon-VAX configuration file
Using the above information, the following configuration can be created:
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DESQA is mapped to the "eth1" network interface. This interface will be used for CHARONCharon-VAX (see the Installation section for more details) on this particular host.
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Making disk images
In our example, possible mappings of the RQDX3 and TQK50 tapes include physical devices and disk and tape images. Tape images have not to be manually created whereas you have to provision disk images, as described below.
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Installation of VAX/VMS operating system
The next step is to transfer the data from the source VAX system to CHARONCharon-VAX. The easiest way to do it is via backups over the network. For this operation we need a bootable, network-enabled operating system on a CHARONCharon-VAX disk image or physical disk.
The example configures the CHARONCharon-VAX MicroVAX 3600 system for installation of VAX/VMS from a distribution CD-ROM (usually it is "/dev/cdrom" if the host has only one CD-ROM drive):
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Run CHARONCharon-VAX and boot from "dua4" ("migration.cfg" is the configuration file we use in this example):
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Making remote backups
Now we are ready to create disk backups from the source VAX system to CHARONCharon-VAX.
Boot the CHARONCharon-VAX virtual machine and make sure that the source VAX system is reachable via DECnet.
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The use of the "SHOW DEVICE /FILES" command would be of help to know files opened on a disk
Let's assume the CHARONCharon-AXP VAX system is node 1.400 in this example. Issue then the following commands from the source VAX system whose prompt is set to "source$ ":
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When the backup procedure will be completed, the disk "DUA3" of the CHARONCharon-VAX virtual machine will contain 4 savesets: "DUA0.BCK", "DUA1.BCK", "DUB0.BCK" and "DUB1.BCK"
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Restore backups to
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Charon-VAX disks
Next, restore the new savesets to their corresponding virtual disks. Login to CHARONCharon-VAX and issue this sequence of commands to restore all the savesets created in the previous step:
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If you are going to have the CHARONCharon-VAX and the original physical VAX system on the network at the same time, you must change the network identity of one (usually the CHARONCharon-VAX).
The easiest way is to boot the CHARONCharon-VAX virtual ized system on the restored system disk with the network disabled and to configure new addresses, as needed.
The NIC can be disabled with a "disabled" statement in the CHARON the Charon configuration file.
Then Enable the network and reboot.
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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 CHARONCharon-VAX host via a PCI card
- Map the tape drive in the CHARONCharon-VAX configuration file
a. Restore the source VAX system backups from tape to disk images via VAX/VMS running on CHARONCharon-VAX.
b. Boot from standalone backups and restore the content to CHARONto Charon-VAX virtual disks. - Dump the source VAX system backups to tape images with the "mtd" utility and:
a. Boot from the freshly installed VAX/VMS system and restore the tape images to CHARONCharon-VAX virtual disks.
b. Boot from standalone backups and restore the content to CHARONto Charon-VAX virtual disks.
- Map the tape drive in the CHARONCharon-VAX configuration file
Create a network cluster between the source VAX system and CHARONCharon-VAX (it is possible to use the source system as a boot server) then perform backups from one disk to another:
$ BACKUP/IMAGE/IGNORE=INTER REAL$DUA0: DUA0:
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