Volume Shadowing for OpenVMS

Index

• Addressing data
  • recovery from errors
• ALLOCATE command
• Allocation classes
  • naming format
  • nonzero
• Assisted copy operations
  • enabling
  • MSCP DCD commands
  • See also Copy assists
• Assisted merge operations
  • performance
• AUTOGEN utility
  • using with MODPARAMS.DAT file
• Availability
  • achieved by shadow set configurations
  • levels
  • of data
  • performance impacts
  • recovery from failures
  • with write I/O requests

• BACKUP
  • See Backup utility
• Backup operations
  • See also Backup utility
  • shadow copy as
  • using Backup utility
• Backup utility (BACKUP)
  • /IMAGE qualifier
  • revision number
    • used for copy operation
  • standalone
    • restrictions
• Booting
  • satellite boot devices
  • satellite nodes
  • system disk shadow set

• CI (computer interconnect)
  • and MSCP server access to shadow sets
  • preventing resource saturation
  • shadowing capabilities on
  • utilized for copy operations
• /CLUSTER qualifier
  • mounting a shadow set clusterwide
• cluster systems
  • MSCP server access to shadow sets
• CLUSTER_CONFIG.COM command procedure
  • setting shadowing parameters
• CLUSTER_CONFIG_LAN.COM command procedure
  • setting shadowing parameters
• Compatibility
  • between disks and volumes
• Computer interconnect
  • See CI
• Configuration of a shadow set
  • cluster with multiple HSJs and star couplers
  • effect on availability
  • examples
  • high-availability local area cluster
  • maximum shadow sets #1
  • maximum shadow sets #2
  • one CPU and one controller
  • one CPU and two controllers
  • OpenVMS Cluster with dual controllers
• Consistency
  • data
  • ensuring during failures
  • when adding shadow set members
• Controller errors
  • recovery from
• Controllers
  • performing DCD commands
  • setting preferred path
  • supporting performance assists
  • using performance assists
  • write log entries
• Conversions
  • setting phase II system parameters
• Copy assists
  • controllers supporting
  • disabling
  • disabling on HSC controller
  • overview
  • performance
  • setting preferred path
• Copy operations
  • adding a member
  • after a system failure
  • BACKUP revision number
  • checking
    • for proper dismount
    • volume label
    • volume shadowing generation number
  • controlling with the SHADOW_MAX_COPY parameter
  • DCD connection limits
  • example
  • multiple simultaneous
  • no copy
  • purpose
  • recovery from system failures
  • transitions in shadow set membership
  • with merge operation
• /COPY qualifier
• Copy threads
  • controlling dynamically
  • controlling with the SHADOW_MAX_COPY parameter
  • referred to in status messages
• Crash dumping
  • to system disk shadow sets

• Data
  • changing on individual members
• Data availability
  • See Availability
• Data consistency
  • when adding shadow set members
• Data errors
  • recovery from
• DCD (disk copy data) commands
  • determining the limit
  • setting for HSCs
• DECnet databases
  • example of a satellite node
• Devices
  • allocating
  • recovery from controller errors
  • recovery from data errors
  • recovery from errors
  • recovery from failures
  • recovery from unit or drive errors
  • SCSI support #1
  • SCSI support #2
  • SCSI support #3
  • supported
  • unsupported #1
  • unsupported #2
• DIGITAL Storage Architecture
  • See DSA #1
  • See DSA #2
• DIGITAL Storage Systems Interconnect
  • See DSSI
• Disk mirroring
• Disk volumes
  • initializing
• Disks
  • compatibility with volumes
  • in Files-11 structure
  • initializing
• DISMOUNT command
  • removing a shadow set member
  • required privileges
• Dismounting a shadow set
  • overview
  • with SYS$DISMOU system service
• Dismounting a shadow set member
• Displaying shadow set information
• Dissolving a shadow set
  • with SYS$DISMOU system service
• Distributing members of shadow sets #1
• Distributing members of shadow sets #2
• Distributing shadow sets
• Drive errors
  • recovery from
• DSA (DIGITAL Storage Architecture)
  • naming the virtual unit
  • support for compliant hardware #1
  • support for compliant hardware #2
• DSSI (DIGITAL Storage Systems Interconnect)
  • and MSCP server access to shadow sets

• Error messages
  • mount verification
  • OPCOM
  • shadow server
  • system service
  • VOLPROC
• Errors
  • recovery from
• Ethernet
  • and MSCP server access to shadow sets
  • preventing resource saturation
  • utilized for copy operations

• F$GETDVI lexical function
  • item names
• Failovers
  • strategy
• Failures
  • See Recoveries
• FDDI (Fiber Distributed Data Interface)
  • massively distributed shadowing
• Fiber Distributed Data Interface
  • See FDDI
• Files-11 volume structure
  • shadowing support
• Forced errors
  • checking the SCSI NOFE characteristics

• GRPNAM privileges
  • required for DISMOUNT command
  • required for MOUNT command

• Hardware environment
• HSC (hierarchical storage controller)
  • disabling performance assists
  • setting DCD limit

• /INCLUDE qualifier
• Initializing disk volumes
• Installation
• Installations
  • See License registration
• Interprocessor communications
• Item codes
  • for creating and mounting a shadow set
  • for creating and mounting a volume set
  • to add to a shadow set
  • with SYS$GETDVI system service
  • with SYS$MOUNT system service

• KDM70 controller
  • microcode version requirement #1
  • microcode version requirement #2

• LANCP databases
  • example of a satellite node
• License registrations
  • capacity #1
  • capacity #2
  • for volume shadowing
  • per disk #1
  • per disk #2

• Mass storage control protocol
  • See MSCP
• Member units
  • adding
  • backing up #1
  • backing up #2
  • crash dumping to system disk
  • initializing
  • mounting
  • on satellite nodes
  • requirement for nonzero allocation class
  • shadow set
• Membership
  • adding a new disk
  • data consistency
  • during steady state
  • transitions during copy operations
  • transitions during merge operations
  • transitions during minimerge operations
• Merge operations
  • after a system failure
  • automatic throttling of copy operations
  • controlling with the SHADOW_MAX_COPY parameter
  • example
  • multiple simultaneous
  • purpose
  • transitions in shadow set membership
• Messages
  • displayed for unregistered nodes
  • mount verification
  • OPCOM
  • shadow server #1
  • shadow server #2
  • system service
  • VOLPROC
• Migrating to phase II
• Minimerge operations
  • actions during system failure
  • after a system failure
  • controllers supporting
  • disabling
  • disabling on HSC controller
  • overview
  • performance
  • write log entries
• Mirroring
  • disks
• MNT$_SHAMEM item code
• MNT$_SHANAM item code
• MODPARAMS.DAT file
  • editing in an OpenVMS Cluster
  • example
  • setting parameters in
• MOUNT command
  • adding shadow set members
  • /CLUSTER qualifier #1
  • /CLUSTER qualifier #2
  • /CLUSTER qualifier #3
  • /COPY qualifier
  • format
  • /INCLUDE qualifier
  • /NOASSIST qualifier
  • /NOMOUNT_VERIFICATION qualifier
  • /OVERRIDE=IDENTIFICATION qualifier
  • /OVERRIDE=SHADOW_MEMBERSHIP qualifier
  • qualifiers #1
  • qualifiers #2
  • reconstructing shadow sets with /INCLUDE
  • required privileges #1
  • required privileges #2
  • shadowed volume sets
  • /SYSTEM qualifier
• Mount utility
  • See MOUNT command
• Mount verification
  • messages
• Mounting
  • devices
  • shadow sets
  • virtual units
  • volume sets #1
  • volume sets #2
• MSCP (mass storage control protocol)
  • DCD commands
  • server
  • serving a shadow set
  • supported devices

• Naming conventions
  • for shadow set #1
  • for shadow set #2
• Network connections
• NOFE (no forced error bit)
• /NOMOUNT_VERIFICATION qualifier

• OPCOM (Operator Communication Manager)
  • messages
• OpenVMS Cluster systems
  • enhanced shadowing performance
  • interprocessor communications
  • maximum number of shadow sets #1
  • maximum number of shadow sets #2
  • mounting shadow sets
  • mounting the virtual unit
  • providing high data availability
  • requirement for nonzero allocation class
  • shadowing across
  • updating system parameters for
• OPER privileges
  • required for MOUNT command
• Operating system versions
  • compatibility with phase I to phase II volume shadowing
• Operating systems
  • upgrading on a shadowed system disk
• /OVERRIDE=IDENTIFICATION qualifier
• /OVERRIDE=SHADOW_MEMBERSHIP qualifier

  5423PIDX.HTM
  OSSG Documentation
  22-NOV-1996 13:03:52.39

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