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Dell SRDF Introduction
Hide Table of Contents
Notes, cautions, and warnings
Preface
Introduction
Overview
SRDF supported features
What is SRDF?
Disaster recovery
High availability
Data migration
SRDF concepts
SRDF device pairs
R1 and R2 devices
R11 devices
R21 devices
R22 devices
Invalid tracks in SRDF pairs
SRDF groups
Dynamic devices
R1/R2 personality swap
SRDF modes of operation
Synchronous mode
Asynchronous mode
Active mode
Adaptive copy modes
Adaptive copy disk
Adaptive copy write-pending
Domino modes
Geometry Compatibility Mode
SRDF device states
Host interface view
R1 device states
R2 device states
SRDF view
R1 device states
R2 device states
Device pair states
R1/R2 device accessibility
SRDF device and link state combinations
SRDF consistency
Nodes, links, and ports
PowerMaxOS
Mixed configurations
Disaster recovery
Two-site configurations
Three-site configurations
Concurrent SRDF
Concurrent SRDF/S with Enginuity Consistency Assist
Cascaded SRDF
SRDF/Star
Concurrent SRDF/Star
Concurrent SRDF/Star with R22 devices
Cascaded SRDF/Star
Cascaded SRDF/Star with R22 devices
SRDF/Star for open systems
SRDF/Star for mainframe systems
Mainframe-specific variations of SRDF/Star
SRDF/Star restrictions
Four-site configurations
Four-site configurations
Four-site mainframe configurations (SRDF/SQAR)
SRDF recovery scenarios
Planned failover (SRDF/S)
Unplanned failover
Failback to the primary array
Recovery for a large number of invalid tracks
Temporary link loss
Permanent link loss (SRDF/A)
SRDF/A session cleanup
Failback from R2 devices
Replication of VMWare vVols
vVol architecture
Remote replication in a vVols environment
Management facilities
High availability
SRDF/Metro
SRDF/Metro life cycle
Initial provisioning and configuration setup
Add and remove devices
Remove the SRDF/Metro configuration
SRDF/Metro configuration changes
Add devices
Remove devices
SRDF/Metro resilience
Witness
Array Witness
Virtual Witness (vWitness)
Witness negotiation and selection
Witness failure scenarios
Device Bias
Preventing data loss
Specifying the resiliency method
Mobility ID with ALUA
Disaster recovery facilities
Highly available disaster recovery (SRDF/Metro Smart DR)
Independent disaster recovery
Deactivate SRDF/Metro
SRDF/Metro restrictions
Data migration
Introduction to data migration using SRDF
Non-disruptive migration
Migration from VMAX array
Process
Migration from VMAX All Flash or VMAX3
Process
Other features
Migrating data with concurrent SRDF
Replacing R1 devices with new R1 devices
Replacing R2 devices with new R2 devices
Replacing R1 and R2 devices with new R1 and R2 devices
Migration-only SRDF
Device Migration operations requirements
SRDF I/O operations
SRDF write operations
Write operations in synchronous mode
Write operations in asynchronous mode
Cycle switching in asynchronous mode
PowerMaxOS or HYPERMAX OS
Enginuity 5876
SSC cycle switching in concurrent SRDF/A
SRDF/A MSC cycle switching
PowerMaxOS 10 (6079), PowerMaxOS 5978, or HYPERMAX OS 5977
Enginuity 5876
Write operations in cascaded SRDF
SRDF read operations
Read operations if R1 local copy fails
PowerMaxOS or HYPERMAX OS
Read operations from R2 devices
SRDF/A resilience and performance features
Tunable cache
SRDF/A cache data offloading
PowerMaxOS or HYPERMAX OS
Enginuity 5876
Mixed configurations: PowerMaxOS or HYPERMAX OS and Enginuity 5876
Transmit Idle
Write folding
Write pacing
Group pacing
Device (TimeFinder) pacing
PowerMaxOS 5978 or HYPERMAX OS 5977
Enginuity 5876
Write pacing and Transmit Idle
Management tools
Solutions Enabler
Unisphere
SRDF/TimeFinder Manager for IBM i
Mainframe management tools
Mainframe Enablers
SRDF Host Component for z/OS
SRDF/A Monitor
WPA Monitor
SRDF/AR process management
Geographically Dispersed Disaster Restart (GDDR)
More information
Solutions Enabler CLI
Unisphere
Mainframe Enablers
GDDR
SRDF/TimeFinder Manager for IBM i
SRDF/Metro vWitness
SRDF Interfamily Compatibility
Storage arrays
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