Operating Systems in a Virtual Machine (Rel 6 PLC 17 Apr81)
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VM!370 Directory Source File j (fn DIRECT fm) By using the directory program, an installation converts sou rce statements into the VM!370 system directory file. VM/370 Directory Entry USER DOSUSER DOSPWORD 320K CONSOLE 01F 3215 SPOOL OOC 2540 R , SPOO L OOD 2540 P , SPOOL OOE 1403 J MDISK 13033301 100 VMPK01 MDISK 131 33302050 VMPK02} MDISK 13233307030 VMPK02 DEDICATE 007 007 VM/370 Storage r---, I Virtual I Storage I I I 320K I i L __ ..J I Virtual Console I I Virtual Card Reader ( OOC I I I L ____ ..J Virtual Card Punch rOOD I L ____ --1 Virtual Printer I "" __ - --' J Real Device Dedicated to DOSUSER Figure 13. Relationship of VM/370 Directory Entries Section 1. General Considerations 39
UNIQUE DIRECTORY ENTRY CONSIDERATIONS This topic lists directory control statements in their logical order of appearance in a directory entry. It describes only those statements with unique ccnsideraticns for running an operating system in a virtual machine. The USER centrol statement has no unique considerations for running an operating system in a virtual machine. The ACCOUNT centrel statement has no unique considerations for running an operating system in a virtual machine. The OPTION central statement allows virtual machine users to specify certain optiens and features for their virtual machines. The ACCT option allows one user to charge another user for virtual machine reseurces. For example: If the machine is performing a batch type operation, a virtual machine user can generate job accounting cards fer each jcb processed. To generate accounting cards for a virtual user, refer to the for a discussion of DIAGNOSE code X'4C'. Specify the ECMODE option if the virtual machine uses an operating system that: • Runs in extended control mode • Uses dyna mic add re ss tra nsla tion (DA T) • Uses extended control registers other than zero • Addresses I/O channels 6 through 15 If this optien is not specified in the directory, a user can enter EC mede by issuing the CP SET command with the ECMODE operand: #cp set ecmode on When the ECMODE option is specified for a virtual machine, the saved segments cf the virtual operating system are shareable. 40 IBM VM/370 Operatin1 Systems in a Virtual Machine