HP
recommends that a CD drive be available for each instance in an
OpenVMS Galaxy computing environment. If you plan to use multiple
system disks in your OpenVMS Galaxy, a CD drive per instance is helpful
for upgrades and software installations.
If your OpenVMS Galaxy instances are clustered together and
use a single common system disk, a single CD drive may be sufficient
because the CD drive can be served to the other clustered instances.
For operating system upgrades, the instance with the attached CD
drive can be used to perform the upgrade.