HP 3000 Manuals HP 3000 Manuals
Volume Sets
MPE XL supports two types of volume sets: system volume sets and
nonsystem (mountable) volume sets.
System Volume Sets
The system volume set is the only volume set needed to load and start the
system. The system volume set contains the MPE XL operating system;
these system volumes must be mounted on the disk drives at all times.
The system master volume set is located on ldev 1. The system master
volume is initialized at system installation, when the INSTALL utility is
run. It is the only volume that exists on the system at that time.
Additional system volumes are configured to the system using the volume
management utility, VOLUTIL, rather than the system configuration
utility, SYSGEN, although the I/O path to the devices must be configured
in SYSGEN.
The name MPEXL_SYSTEM_VOLUME_SET is applied to all system volume sets.
Nonsystem Volume Sets
The nonsystem volume sets are analogous to Private Volumes on the MPE V/E
system. Nonsystem volume sets do not need to be mounted for the
operating system to run. You can remove (dismount) some or all of the
volumes in a nonsystem volume set by using the VSCLOSE command.
Volume Set Status
The status of volume sets falls into five categories:
* MASTER: the volume that must be mounted in order for MPE to
recognize the volume set.
* MEMBER: volume in a volume set whose master is mounted.
* LONER: volume in a volume set whose master is not mounted or
volumes of a set that has been VSCLOSEd.
* SCRATCH: volume which may contain data which the user
has indicated is no longer needed. It is available for
initialization.
* UNKNOWN: a volume that does not have a label that the system can
recognize. It is also available for initialization.
Volume Classes
A volume class is a subset of a volume set. A volume set can contain
from one to 255 classes. A volume class can contain from one to 255
volumes. A volume can be a member of as many classes as there are in a
volume set. A volume class cannot belong to more than one volume set.
For compatibility between MPE V and MPE XL, a volume class named "DISC"
is created automatically whenever a volume set is created. By default,
all of the volumes in the volume set are members of the class "DISC," and
all of the files on the disk, by default, also are restricted to the
class "DISC."