Document revision date: 15 July 2002

A
/ABORT_VIRTUAL_UNIT qualifier
Addressing data
recovery from errors
ALLOCATE command
Allocation classes
naming format
nonzero
ALLOCLASS parameter #1
ALLOCLASS parameter #2
Assisted copy operations
See Copy operations
ATM
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
B
Backup operations
data consistency requirements
database systems
guidelines for using shadow set member
host-based RAID
mapped files
multiple shadow sets
OpenVMS Cluster operations
OpenVMS file system
restoring data
revalidation of data consistency methods
RMS considerations
shadow copy as
testing
using Backup utility
virtual cache
XFC
Backup utility (BACKUP)
/IMAGE qualifier
revision number
standalone
restrictions
Booting
satellite boot devices
satellite nodes
system disk shadow set
C
CI (computer interconnect)
and MSCP server access to shadow sets
preventing resource saturation
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
shadow set members
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
one system with one adapter
one system with two host-based adapters
OpenVMS Cluster with dual adapters
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
Copy assists
See Copy operations
Copy operations
adding a member
after a system failure
assisted
controllers supporting
disabling on HSC controller #1
disabling on HSC controller #2
overview
performance
setting preferred path
BACKUP revision number
comparison with minicopy
controlling with the SHADOW_MAX_COPY parameter
example
multiple simultaneous
no copy
performance of minicopy versus DCD copy
proper dismount
purpose
recovery from system failures
transitions in shadow set membership
unassisted
volume label
volume shadowing generation number
with merge operation
/COPY qualifier
Copy threads
controlling dynamically
controlling with the SHADOW_MAX_COPY parameter
referred to in status messages
/COPY_SOURCE qualifier
Crash dumps
shadowed system disk and minicopy
written to system disk shadow set
D
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
DECnet databases
example of a satellite node
Devices
allocating
DECram served device
recovery from controller errors
recovery from data errors
recovery from errors
recovery from failures
recovery from unit or drive errors
SCSI support
supported
unsupported
Digital Storage Architecture
See DSA
Digital Storage Systems Interconnect
See DSSI
Disaster tolerant OpenVMS Cluster systems
See OpenVMS Cluster systems
Disk mirroring
Disk volumes
initializing
Disks
compatibility to form a shadow set
in Files-11 structure
initializing
SCSI support
DISMOUNT command
creating a write bitmap
/POLICY qualifier
removing a shadow set member
required privileges
DISMOUNT/FORCE_REMOVAL command
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
Distributing shadow sets
DOSD (dump off system disk) #1
DOSD (dump off system disk) #2
use of DUMPSTYLE
Drive errors
recovery from
DSA (Digital Storage Architecture)
naming the virtual unit
support for compliant hardware
DSSI (Digital Storage Systems Interconnect)
and MSCP server access to shadow sets
DUMPSTYLE system parameter
E
Error messages
mount verification
OPCOM
shadow server
system service
VOLPROC
Errors
recovery from
Ethernet
and MSCP server access to shadow sets
Gigabit Ethernet usage
preventing resource saturation
utilized for copy operations

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