--- - -...l ---- ----- ---"' 3850 MSS Therefore, the following rule must be used when defining (via IOGEN) 3330V devices in a VS system to run in a virtual machine to which an KSC in ter face is dedicated.
For each3330V defined in the VS system there must be a corresponding 3330V defined to VM/370 and allocated to the virtual machine.
For example, if you wish to dedicate real3330Vs 240 through 27F to
virtualCPUID 22222 as virtual devices 140 through 17F, then only 3330Vs 140-17F can be defined (via IOGEN) in the OS/VS system running in CPUID 22222. I SPECIAL CONSIDERATIONS FOR THE VS1/VS2 CENTRAL SERVER VIRTUAL MACHINE At detach time, the VM/370 control program destages changed cylinders on a'volume when the use count for the entire volume reaches zero. The
destaqe function is accomplished by a relinquish order to theMSS throuqh the central server. A relinquish order iR for volume-IDs mounted on SYSVIRT and VIRTUAL virtual unit addresses
which have had a volume mounted on them byVM/370 on behalf of the guest
operating system. No data are destaged forVIRTUAL units that were not
mounted byVM/370. The following VS1/VS2 APARs must be applied to the central server
virtual machine operating system whenVM APAR 11344 (relinquish
function) is applied to theVM/370 control program. The following APARs
should be applied regardless of whether the new function is desired:COMEQNENT SC.1]] SC1CI SC1DP VS1 APAR OX27455 OX27456 OX27453 OX27454 VS1 SPE BASE UX90058 UX90059 UX90054 UX90056 VS1 SPE MSSE UX90055 UX90057 VS2 APAR OZ49650 OZ49655 OZ49642 OZ49643 VS2 SPE BASE UZ90134 UZ90135 UZ90130 UZ90132 VS2 SPE MSSE UZ90131 UZ90133 VM/370 APAR 11342 permits general use volume sharing on 3330 virtual
unit addresses between aVM/370 system and a native VS1/VS2 system when
the unit control blocks are not generated in theVS1/VS2 central server
virtual machine. The followingVS1/VS2 APARs must be to the
central server virtual machine operating system when this fUnction is
desired:VS1 VS2 APAR PTF APAR PTF OX24117 UX15678 OZ48289 UZ33530 If general use volume sharing is not desired, these APARs do not
have to be applied.
74 IBMVM/370 Planning and System Generation Guide
For each
For example, if you wish to dedicate real
virtual
destaqe function is accomplished by a relinquish order to the
which have had a volume mounted on them by
operating system. No data are destaged for
mounted by
virtual machine operating system when
function) is applied to the
should be applied regardless of whether the new function is desired:
unit addresses between a
the unit control blocks are not generated in the
virtual machine. The following
central server virtual machine operating system when this fUnction is
desired:
have to be applied.
74 IBM