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1
GCOS 8 Session
TechSem 2001 Paris, March 28-30
Virtual Machine Facility Update Phil Angelle,
GCOS 8 Development
2
Agenda

• VMF Introduction
• Product definition
• Terminology
• VMF Architecture
• VMF Operations
• VMM dispatching control
• System split with VMF
• VMF Update
• Summation

3
Product Definition
VMF is a software/hardware product that allows
execution of several copies of GCOS 8 in a single
DPS 9000 system
Bundled with SR5
4
Terminology

• HOS Host Operating System
• GOS Guest Operating System
• VMCP Virtual Machine Control Program
• VMM Virtual Machine Monitor Program
• VMSG Virtual Machine System Generator
• VMEC Virtual Machine Environment Configuration

5
VMF Architecture
6
VMF Operations

• Test GOS(s)
• Production in HOS
• Minimum resources assigned
• CPU(s), system memory, channels, devices
• CPUs can be assigned and released dynamically
• CPU time controlled by HOS dispatcher queue and
  VMM GOS Limit setting
• GOS can be limited to less than 100 percent of a
  CPU
• Test GOS impact on HOS is minimal

7
VMF Operations (cont)

• Production GOS(s)
• Split production and/or development
• Production GOS(s)
• Development/Test GOS(s)
• GOSs can be booted without impact on other GOSs
• CPU time is controlled by GOS CPU configuration
  and VMM GOS Limit settings
• GOS Limits can be changed dynamically
• CPUs can be assigned and released dynamically
• Clear HOS (no production in HOS)
• Minimum system resources assigned to HOS
• No reason to reboot
• Minimal HOS console operation
• All HOS overhead considered to be part of VMF
  overhead

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VMM Dispatching Control

• Parameters set in VMDC.CFG file
• For each GOS Damper , Quantum, Limit, and Exceed
  Option
• VMF_LIMIT and Exceed Interval
• VMM DPLC UPDATE command updates settings
  dynamically
• VMM DPLC RESET command resets to default
  settings dynamically

9
VMM Dispatching Control (cont)
VMM Dispatching Control Diagram
Exceed Option Settings
Total processor resource available in the system
0
max
Maximum processor available to the HOS
Minimum processor available to the HOS
Default
Sum of GOS Limit Settings
VMF_LIMIT Setting Allows VMM to request
additional dispatches from the HOS up to the
limit specified. VMF_LIMIT defaults to the sum
of GOS limits.
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System split with VMF

• More flexible than physical system split
• More than two systems possible
• CPUs can be split in any combinations
• Memory can be split into different sizes
• Each system can have access to all IOPs
• Each system can have two or more consoles using
  VMF Remote Console capability

11
Agenda

• VMF Introduction
• VMF Update
• Expanded memory
• VMM CPU board affinity dispatching
• Optimized partitioning
• GOS boot via IOSP (Callisto) channels
• CMOS Software Performance
• Boot File Replace
• Shared IOSP (Callisto) channels
• Summation

12
Expanded Memory

• Requires Jupiter 2 or Olympus
• SVMX mode requires SR5.0 or later
• Supports SV and SVMX mode GOSs at same time
• GOS can run SVMX mode with HOS in SV mode
• GOS mode specified in VMEC file or on VMM BOOT
  GOS-n command
• GOS mode defaults to HOS mode if not specified
• Must specify SV mode when booting 4500.3
• SV mode GOS memory allocated in first GB
• First available with 8VM5.4 Update 1
• Shipped with SR5.0

13
VMM CPU Board Affinity Dispatching

• Olympus systems only
• Keeps GOS CPUs on same CPU Board
• Requires Clear HOS (SR5.0 or later)
• Requires Virtual CPUs configured to be equal or
  less than number of physical CPUs
• First available with 8VM5.4 Update 1
• Shipped with SR5.0

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VMM CPU Board Affinity Dispatching (cont)
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Optimized Partitioning (VMF split)

• Olympus system only
• No measured VMF CPU overhead
• Using VMM CPU Board Affinity Dispatching enabled
• Using 50 ms GOS quantums (manually set for each
  GOS)
• Maximum use of GOS Direct I/O
• GOS gate wait time is automatically increased
  which reduces VMM GOS gate wait service
• First available with 8VM5.4 Update 1
• Shipped with SR5.0

16
GOS Boot via IOSP (Callisto) Channels

• Requires Jupiter 2 and Olympus with Callisto
• Requires SP release that contains the BOOT.GMI
  module
• GOS must be SR5.0 plus upgrade package (SRB
  SK07), SR5.1 or later
• VMM emulates SP HOS boot
• BOOT.GMI module loaded into GOS memory to boot
  GOS
• VMM does not issue I/O to boot device
• ZEUS and Jupiter 1 GOS boot is unchanged
• VMM issues I/O to boot device to load bootstrap
  record
• First available with 8VM5.4 Update 2
• Included in upgrade package (SRB SK07) for SR5.0
  and systems with IOSPs (Callisto)

17
CMOS Software Performance

• VMM Support for SR5.1 CR KL structure changes
• VMM continues to support SR5.0 and earlier CR and
  KL structure format
• VMM structures also changed for more efficient
  CPU Cache utilization
• First available with 8VM5.5
• Ships with SR5.1 and is required for booting
  SR5.1 GOSs

18
Boot File Replace

• VMM provides access to RAS files on SP for GOS
  boot
• GOS bootloader operates same as for non-GOS boots
• Requires G8CM V4 generated RAS.GMI files on SP
• Requires Olympus SP release that supports RAS.GMI
  files
• First available with 8VM5.5
• Ships with SR5.1

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Shared IOSP (Callisto) Channels

• IOSP channels can be shared the same way as FIPS
  channels are shared
• PCI ESCON (Callisto 1)
• PCI ESCON and Fibre (Callisto 2)
• Requires G8CM V5 generated VMEC, HOS and GOS
  configurations (from single database)
• Existing VMF environment configurations can be
  imported into G8CM V5 database
• import (rebuild) HOS G8CM V3/V4 Maintenance Dump
• import ASCII VMEC file (some editing required)
• import (rebuild) each GOS G8CM V3/V4 Maintenance
  Dump

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Shared IOSP (Callisto) Channels (cont)

• VMM ATTACH/DETACH channel commands provided to
  support shared channel testing
• Does not require special SP release
• First available with 8VM5.6
• Supports existing VMF environments on all
  supported DPS 9000 platforms
• Availability 2H2001

21
Migration Table
See notes
22
Summation

• VMF has the functionality
• for efficient
• partitioning of
• DPS 9000 Systems

Exploit your systems avec VMF
Exploit your systems avec VMF
23
Summation

• VMF has the functionality
• for efficient
• partitioning of
• DPS 9000 Systems

VMF
VMF
VMF
Exploit your systems avec VMF
VMF
Exploit your systems avec VMF
VMF