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The DEVTYPE record provides support for a new device type between releases of CA VM:Secure or makes device type names more meaningful or more usable. For example, if you change 3390‑3 to 3390‑9, CA VM:Secure rechecks existing VOLUME and EXTENT records to ensure the update does not invalidate them.
The DEVTYPE record enables you to customize device types by specifying either a prototype device type or an explicit device type. Differences between the two methods are explained in the parameter definitions.
You can redefine entries that CA VM:Secure supplies and change the default block size or limit the number of allocatable units for a device type. For example, if you use the name TEST90 for a 3390 with only 200 cylinders, you can also use the available options to override the defaults that CA VM:Secure specifies.
The DEVTYPE record is optional as long as the device types that you use are included in those that CA VM:Secure supplies. This is the case for most installations, except when a new device type is announced. When CA VM:Secure includes support for new device types in a subsequent release, that DEVTYPE record will be unnecessary.
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