19:15:38 det 1911att 333 operator 191
19:15:52 DASD 131 DETACHED OPERATOR 191
19:15:52 DASD 191 DETACHED
19:15:43 DASD 333 ATTACH TO OPERATOR 191
;9:;5:53 b CMS acc 191 a
R; T=0.39/0.76 19:16:23 L--- Signalling attention causes a read from the virtual CP system, where
the operator detaches the virtual 191 disk and attaches the real 333
disk to his userid as 191. Note that the 333 appears to the virtual CP system as a real disk, when it actually is a virtual disk. The BEGIN
command changes the virtual machine environment to CMS. The ACCESS 191
command is then successfully completed, giving write access to the
virtual 191 disk, which is the virtual CP system's 333 disk previously
linked in write mode. r--- I print profile exec I 19:16:45 PRT DOE OUTPUT OF OPERATOR FILE = 0002 LINES= 00013 , R; T=0.23/0.51 19:16:46 I I I 19:17:05 drain OOe I 19:17:04 PRT OOE SPOOL CLS XA DRAINED L--- ______________________________________________________________ From CMS, the PROFILE EXEC is printed. The virtual CP system
respcnds with a printer output message for file 2, which is the output from the previous print function. The ready message is the response
from the CMS system. This example shows a virtual machine running with
a virtual ccnsole that is receiving both virtual machine and CP messages. Signaling attention places the virtual machine in virtual CP mode, where the user can specify a drain of device OOE. The system
responds with a message indicating that the device is drained. This
indicates that the virtual CP system has completed printing on what it
thinks is a real printer. This printer is actually spooled by the real CP system. r--- I ! ! I CP I close OOe I b I CMS L
Signalling attention returns the user to the real CP system level,
where he issues a CLOSE OOE command, followed by a BEGIN. This allows
him to have the spooled output of the virtual VMj370 system printed on
the real VM/370 system printer. r---- ---, I ! I I 19:19:44 set dump auto CP I , I I 19:19:51 q dump I I 19:19:55 DASD 330 DUMP UNIT CP 1
66 IBM iM/370 Operating Systems in a Virtual Machine

Signalling attention takes the user to the virtual CP level, where he
issues a SET DUMP command. Ordinarily, when testing an unstable
system, this would have been one of the first commands entered after
issuing the IPL for the virtual CP system. The query of the dump unit
verifies that the dump is of the CP nucleus to the spooling disk at
address 330. r---------------------------------------.----------- ! ! CP system restart
RRRR •••• RING •••• GGGG 19:20:06 DMKDMP9081 SYSTEM FAILURE, CODE PSA002 RRRR •••• RING •••• GGGG
RRRR •••• RING •••• GGGG DMKCKP9601 SYSTEM WARM START DATA SAVED DMKDSP450w CP ENTERED; DISABLED WAIT PSW CP DMKCKP961W SYSTEM SHUTDOWN COMPLETE CP ••• RING •••• GGGG CP -, I I I Signalling attention takes the user to the real CP level, where he
enters the ccmmand SYSTEM RESTART. This command is the equivalent of a
system restart function on a real processor. The system restart
function for a CP system automatically dumps the system and then issues IPL again. After the system is dumped, a message appears with abnormal
termination code PSA002 (a system dump due to pressing the system
restart key).
The virtual bell rings to indicate that the system has been reloaded, and the system prints messages about: saving warm start data, CP entering a disabled wait state, and system shutdown being complete. The
message indicating that CP has entered a disabled wait is
Fremature1y issued between these two messages. It occurs because of a
synchronizaticn of the real CP system with the virtual CP system console
output.
After these messages are issued, the user is in real CP mode. He can
either log cff or obtain the system abend dump.
To obtain this dump, re-IPL 330 and repeat the test procedure up to
the Foint where the 'print profile exec' is shown in the same session.
At this peint, the user now has eMS initialized in the virtual CP system and has read/write access to his real eMS minidisk at virtual address
191. By issuing a QUERY RDR ALL command, VM/370 should reveal that a
class D dumF file is in the operator's virtual reader (because the
operator's userid is specified in the SYSDUMP operand of the SYSOPB system generation macro instruction) • Section 2. VM/370 in a Virtual Machine 67