Updated: 11 December 1998

Volume Shadowing for OpenVMS

A
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
B
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
C
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
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
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
E
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
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
G
GRPNAM privilege
required for DISMOUNT command
required for MOUNT command
H
Hardware environment
HSC disk controllers
disabling performance assists
setting DCD limit

Copyright © Compaq Computer Corporation 1998. All rights reserved. Legal

5423PRO_INDEX.HTML