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HP OpenVMS Systemsask the wizard |
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The Question is: If I change the physical SCSI ID of the system disk, will this affect the operation of VMS? The Answer is : Other than all that changing the system disk device name entails, no. If, for instance, you change the system disk at SCSI unit zero to SCSI unit one, then the physical device name of the disk will change from DKA0: to DKA100:. While OpenVMS will function with this, many sites choose to hard-code device names, and this can lead to problems. Before you fix the physical disk device name references likely found within the site-specific software, you will want to learn about logical names and particularly about how to set up and how to use logical names. In this case, using the logical name created from the volume label (eg: DISK$volumelabel) or creating and using a site-specific logical name for the specific disk would be an obvious choice for the process of replacement, rather than changing the current references over to the new physical device name. If there is no old device of the same name in the new configuration, you could also define a logical name to reference the new device by the old name. Based on the previous example, you would define the DKA0 logical name to translate to DKA100. This approach is not recommended by the OpenVMS Wizard, as it simply delays the problem and can lead to other oddities, such as the odd behaviour after a new DKA0 device is added.
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