to a remote location via the Remote Spooling Communications Subsystem,
RSCS expects to find the destination identification in the file tag. Tag
datais set, changed, and queried using the CP TAG It to spool terminal input and output. All data sent to
the terminal, whether it be from the virtual machine, the control
program or the virtual machine operator, can be spooled.Spooling is
particularly desirable when a virtual machine is run with its console
disconnected. Console spooling is usually started via the commandSPOOL CONSOLE START An exception to this is when a system operator logs on using a graphics
device. In this instance, console spooling is automatically started and
continues in effect even if the system operator should disconnect from
the graphics device and log on to a nongraphic device. In order to stop
automatic console spooling, the system operator must issue the commandSPOOL CONSOLE STOP SPOOL FILE RECOVERY If the system should suffer an abnormal termination, there are three
degrees of recovery for the system spool files;warm start (WARft), checkpoint start (CKPT), and force start (FORCE). Warm start is
automatically invoked ifSET DUMP AUTO is in effect. Otherwise, the
choice of recovery method is selected when the following message is
issued;
hh: mm: ss START«COLD I WARM I CKPT I FORCE) (DRAIN}) I (SHUTDOWN) :
Bote that a cold(COLD) start does not recover any spool files. After a system failure, the warm start procedure copies spool file,
accounting, and system message data to warm start cylinders on an
auxiliary DASD.When the system is reloaded, this information is
retrieved and the spool file chains and other system data are restored
to their original status. If the warm start procedure cannot be
implemented because certain required areas of storage are invalid, the
operator is notified to take other recovery procedures.
Any new or revised status of spool file blocks, spooling devices, and
spool hold queue blocks is dynamically copied to checkpoint cylinders on
an auxiliary DASD as they occur.When a checkpoint (CKPT) start is
requested, this is the information that is used to recreate the spocl
file It differs from warm start data in that only spool file
data is restored; accounting and system messages information is not
recovered. Also, the order of spool files on any particular restored
chain is not the original sequence but a random one.Part 2. Control Program (CP) 81
RSCS expects to find the destination identification in the file tag. Tag
data
the terminal, whether it be from the virtual machine, the control
program or the virtual machine operator, can be spooled.
particularly desirable when a virtual machine is run with its console
disconnected. Console spooling is usually started via the command
device. In this instance, console spooling is automatically started and
continues in effect even if the system operator should disconnect from
the graphics device and log on to a nongraphic device. In order to stop
automatic console spooling, the system operator must issue the command
degrees of recovery for the system spool files;
automatically invoked if
choice of recovery method is selected when the following message is
issued;
hh: mm: ss START
Bote that a cold
accounting, and system message data to warm start cylinders on an
auxiliary DASD.
retrieved and the spool file chains and other system data are restored
to their original status. If the warm start procedure cannot be
implemented because certain required areas of storage are invalid, the
operator is notified to take other recovery procedures.
Any new or revised status of spool file blocks, spooling devices, and
spool hold queue blocks is dynamically copied to checkpoint cylinders on
an auxiliary DASD as they occur.
requested, this is the information that is used to recreate the spocl
file
data is restored; accounting and system messages information is not
recovered. Also, the order of spool files on any particular restored
chain is not the original sequence but a random one.