storage volumes containing
cated to the virtual machine. These volumes appear to the virtual machine as
machines that run
mass storage volumes using dedicated device support.
Whenever an
required, the device is selected from the pool of available
system generation time. If a volume must be demounted,
the device on which the volume is currently mounted. .
To pass mount and demount orders, the virtual machine must have an
dedicated to it via the ATTACH command or the DEDICATE directory statement.
An application program named
as an interface between
and the
program.
If the
the
staging adapter to generate a pack change interrupt (an unsolicited device end) on
the device when that device has been mounted.
rupt, the RDEVBLOK is set to indicate that the volume is mounted, and any
was rejected, no further processing of the mount occurs. The previously allocated
RDEVBLOK is marked free and processing continues with the next
Asynchronous
When an
or an
machine as soon as
continue to execute before the virtual device specified on the MDISK, DED, LINK,
or ATTACH is available.
The reasons for asynchronous
required to complete the mount, and the chance that an error may occur in the
be vital to the specific task to be accomplished. Also, if an error occurs in the
error indication is passed from the
3 However, the central server cannot issue these CP commands. The central server is the
mands issued to the central server are ignored and a message is issued.