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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 the CHARON-VAX based virtual system needs to be created from scratch, refer to this Application Note 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 system
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Turn on your source VAX system. At the ">>>" prompt, issue the "show qbus" and "show device" commands:
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To find out the exact types of controllers please refer to documentation on the source VAX system.
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Creation of CHARON-VAX configuration file
Using the above infoinformation, the following configuration can be created:
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Note the Qbus addresses specification: The the number is prefixed with "0", meaning it is an octal value. The number of digits reflects the 22 bit bits Qbus architecture.
Additional DHQ11 serial lines can be mapped later. For now, only 2 lines are configured. They , they are mapped to IP ports 10010 and 10011.
DESQA is mapped to the "eth1" network interface. This interface will be used for CHARON-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 Tape images should have not to be manually created , whereas you have to provision disk images, as described below.
Our example creates disk images of the original physical type. In reality, this step is the best opportunity in the migration to provision bigger larger disks to get extra storage space.
Create special directories for storing disk and tape images, as needed. Created These directories are referenced in the sample configuration file above.
$ mkdir /my_disks$ mkdir /my_tapes |
Next, create the disk images using the "mkdskcmd" utility:
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Installation of VAX operating system
The next step is to transfer the data from the source VAX system to CHARON-VAX. The easiest way to do it is via backup backups over the network. But for For this operation we need a bootable, network-enabled operating system on a CHARON-VAX disk image or physical disk.
The example configures the CHARON-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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DUA3 will be the disk where all the source disks will be copied so its size needs to be large enough to store all the disk backup images.
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Create an empty disk image for installation of VAX/VMS and another one for storing backups from the source VAX system as it is shown in the section above:
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Install VAX/VMS including DECnet on "dua2". The DECnet address must belong to the same area as the source VAX system.
Login to the newly installed VAX/VMS system and Initialize the disk intended for backups storage:
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. Let's assume it's prompt is "newvms$ ".
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Making remote backups
Now we are ready to create disk backups from the source VAX system to CHARON-VAX.
Boot the CHARON-VAX virtual machine and make sure that the source VAX system is available reachable via DECnet.
Login to the source VAX system. S, shut down all the batch queues, kick off the users, stop all applications and close databases if any databases. The commands listed in the SYS$MANAGER:SYSHUTDWN.COM file may be helpful. The goal is to close as many files as possible. The system disk will have several files opened (pagefile, swapfile, etc.), but this is a normal .Issue (letsituation.
The use of the "SHOW DEVICE /FILES" command would be of help to know files opened on a disk
Let's assume that the CHARON-VAX AXP system is node 1.400 in this example). Issue then the following commands from the source VAX system whose prompt is set to "source$ ":
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Once When the backup procedure completes will be completed, the disk "DUA3" of the CHARON-VAX virtual machine will contain 4 savesets: "DUA0.BCK", "DUA1.BCK", "DUB0.BCK" and "DUB1.BCK"
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Restore backups to CHARON-VAX disks
Next, restore the new savesets to their corresponding virtual disks. Login to CHARON-VAX and issue this sequence of commands to restore all the savesets created on in the previous step:
$ $ $ $ |
Now reboot If you are going to have the CHARON-VAX and boot from the same boot disk as you do on the source VAX system.
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the original physical VAX system on the network at the same time, you must change the network identity of one (usually the CHARON-VAX).
The easiest way is to boot the CHARON-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 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 . For example:
- Connect a SCSI tape drive to the CHARON-VAX host via a PCI card
- Map the tape drive in the CHARON-VAX configuration file
a. Restore the source VAX system backups from tape to disk images via VAX/VMS running on CHARON-VAX.
b. Boot from standalone backups and restore its the content to 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 CHARON-VAX virtual disks.
b. Boot from standalone backups and restore its the content to CHARON-VAX virtual disks.
- Map the tape drive in the CHARON-VAX configuration file
Create a network cluster between the source VAX system and CHARON-VAX (it is possible to use the source system as a boot server) ; then simple backup perform backups from one disk to another:
$ BACKUP/IMAGE/IGNORE=INTER REAL$DUA0: DUA0:
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