Universal Replicator User Guide for VSP One Block

Version: 10.3.x
Audience: anonymous
Part Number: MK-23VSP1B016-01

Overview of Universal Replicator
About Universal Replicator
Replication operations
Obtain journal
Journal copy
Restore journal
System components
Storage systems
Pair volumes
Journal volumes
Journals
Mirror
Split mirror operations
Resync mirror operations
Delete mirror operations
Data path
Consistency groups and journals
Command Control Interface (CCI)
Copy operations
Initial copy operation
Update copy operation
Read and write I/O during remote copy
Differential data management
S-VOL write option
Pair status
Pair status definitions
Additional information on pair status
UR PSUS types and behaviors
UR PSUE types and behaviors
Requirements and specifications
System requirements
Interoperability requirements
Volume types that can be shared with Universal Replicator
Using DP-VOLs that are also used by ShadowImage pairs or Volume Migration
Data Retention Utility
Dynamic Provisioning
Preparing a virtual volume for use as an S-VOL
Global-active device
Global storage virtualization
Provisioning
Resource Partition Manager
Thin Image Advanced
UR basic configuration with TI
3DC cascade configuration with TI
3DC multi-target configuration with TI
Delta Resync configuration with TI
Universal Volume Manager
Virtual LUN
Volume Migration
Planning for Universal Replicator
Data transfer speed considerations
RAID group configuration
Fibre Channel or iSCSI port configuration
Sizing journal volumes
Planning journals
Planning journal volumes
Planning journal volumes for delta resync
Planning pair volumes
Maximum number of pairs allowed
Calculating maximum number of pairs
Maximum initial copy operations and priorities
Restrictions when creating an LU whose LU number is 2048 or greater
Restrictions when creating a pair using a namespace whose namespace ID is 2049 or greater
Disaster recovery considerations
Host failover software
Shared memory
Adding shared memory
Removing shared memory
Sharing volumes with other product volumes
Planning UR in multiple storage systems using a consistency group
Preparing the storage systems for UR
Advanced system settings
Planning the data path
Data path design
Sizing bandwidth
Five sizing strategies
Calculating bandwidth
Sizing bandwidth for peak write-workload
Sizing bandwidth for peak rolling average write-workload
Latency
Packet loss
Planning ports for data transfer
Port types
Supported data path configurations
Fibre Channel data path requirements
Additional switches
Fibre Channel used as remote paths
iSCSI data path requirements
Restrictions when using NVMe-oF or NVMe/TCP
UR configuration operations
Configuration workflow
Configuring primary and secondary storage systems for UR
Configuring additional remote paths
Creating journals and adding journal volumes
Assigning an MP unit to a journal
Creating a UR pair
GAD 3DC delta resync (GAD+UR) configurations
Configuring GAD 3DC delta resync
Sites
Storage systems
Servers
Networks
GAD+UR pairs
Primary storage system settings
GAD secondary storage system settings
UR secondary storage system settings
CCI server configuration
Workflow for creating a GAD 3DC delta resync environment
Initial state
Preparing the UR secondary site
Installing the software products
Creating command devices
Creating command devices using CCI in-band and out-of-band methods
Creating the UR delta resync pairs
Creating the configuration definition file
Starting CCI
Connecting the GAD secondary system and the UR secondary system
Adding remote connections
Setting up the GAD secondary storage system
Setting up the UR secondary storage system
Updating the CCI configuration definition files
Creating the UR delta resync pairs
Creating the UR pairs in a GAD+UR configuration
Adding remote connections
Setting up the primary storage system
Updating the CCI configuration definition files
Creating the UR pairs
Starting GAD+UR operations
UR disaster recovery operations
Overview of disaster recovery operations
Workflow for disaster recovery
Preparing for disaster recovery
Preparing for file and database recovery
Switching host operations to the secondary site
Reversing copy direction from secondary to primary site
Resuming host operations at the primary site
Recovery for 3DC UR/TC
Recovery for 3DC UR/TC cascade configuration
Recovery for 3DC UR/TC multi-target configuration
Recovering from primary site failure
Recovering from primary and secondary site failure (3DC multi-target)
Recovery in a delta resync configuration
Problems with pair status during delta resync recovery
Recovery for UR/SI configurations
Recovery from a failure at the primary site and TC secondary site
Switching from the primary to secondary site (TC secondary site)
Transferring operations back to the primary site (TC secondary site)
Recovery for UR/GAD configurations
Disaster recovery in a GAD 3DC delta resync environment
Status before failure
Recovering from primary site and P-VOL failures (GAD+UR)
Recovering from a primary site failure (GAD+UR)
Recovering from a P-VOL failure (LDEV blockade) at the primary site (GAD+UR)
Reversing the GAD P-VOL and S-VOL (GAD+UR)
Recovering from secondary site and S-VOL failures (GAD+UR)
Recovering from a secondary site failure (GAD+UR)
Recovering from a failure (LDEV blockade) on an S-VOL at the secondary site (GAD+UR)
Recovering from a failure at the primary and secondary sites (GAD+UR)
Recovering from a failure on the UR delta resync pair
Workflow to recover from a failure that does not require replacing journal volumes
Workflow to recover from a failure that requires replacing journal volumes
Recovering from a quorum disk failure (GAD+UR)
Recovering from a quorum disk failure when one GAD volume is accessible
Recovering from a quorum disk failure when neither GAD volume is accessible
Troubleshooting
General troubleshooting
Remote path status problems
Troubleshooting by suspend type
Troubleshooting hardware problems affecting pairs
Troubleshooting with CCI
Service information messages (SIMs)
SIM reference code tables
UR pair operations
Behavior when performing pair operations
Checking the pair status
Splitting a UR pair
Splitting a mirror
Creating point-in-time copies
Resynchronizing a UR pair
Resynchronizing a mirror
Deleting a UR pair
Deleting a mirror
Managing pairs in a GAD 3DC delta resync environment
Executing delta resync
Notes on delta resync
In case of delta resync failure
Resynchronizing GAD pairs in a GAD 3DC delta resync environment
Deleting GAD pairs in a GAD 3DC delta resync environment
Monitoring the UR system
Monitoring pair activity, status, license capacity
Suspend conditions for Universal Replicator pairs
Monitoring UR pair synchronization rate
Monitoring copy operations and I/O statistics
Monitoring journal (mirror) status
Monitoring UR remote connections and path status
Maintaining the UR system
Pair maintenance
Changing the maximum initial copy activities option
Changing the pair options
Forcibly deleting pairs
Releasing the differential data managed in a pool
Workflow to restore a pair by adding a reserve journal volume
Restoring a pair without adding a reserve journal volume
Journal and mirror maintenance
Changing options used by journals
Changing options used by mirrors
Replacing a journal volume with a reserve journal volume
Replacing a journal volume with a reserve journal volume
Replacing a journal volume with a reserve journal volume of a UR pair for delta resync with GAD
Adding a reserve journal volume
Deleting journal volumes from a journal
Deleting journals
Remote path maintenance
Modifying the data-transfer time threshold
Deleting remote paths
Deleting the UR relationship
Expansion of DP-VOL capacity while keeping pair status
Expanding DP-VOL capacity used in Universal Replicator pair
Expansion order policy when Universal Replicator pair shares the same volumes with other software
Expanding DP-VOL capacity when TrueCopy pair is used with Universal Replicator
Expanding DP-VOL capacity in a 3DC cascade configuration or a 3DC multi-target configuration with UR pair and TC pair
Expanding DP-VOL capacity in a 3DC delta resync configuration with UR pair and TC pair
Expanding DP-VOL capacity when UR pair is used with ShadowImage
Calculating the numbers of differential and pair tables for each pair
Expanding DP-VOL capacity when UR pair is used with Thin Image
Calculating the snapshot estimated manageable capacity, the numbers of cache management devices, and the subscription limit of the V-VOL capacity
Expansion order policy in configuration where P-VOL in remote replication shares the same volume with S-VOL in local replication
Expansion order policy in 3DC cascade, 3DC multi-target, or 3DC delta resync configuration with remote replications
Expansion order when remote replications in a 3DC cascade configuration share the same volumes with local replications (ShadowImage/Thin Image)
Recovering from failure if one volume capacity in Universal Replicator pair cannot be expanded
Recovering from failure if one volume capacity in Universal Replicator pair has been expanded
Managing power-off for systems and network devices
When power stops unexpectedly
When power is removed from primary or secondary storage system
When power is removed from network relay devices
Planned outage of storage systems and network devices
Powering-off the primary or secondary storage system
Powering-off primary and secondary storage systems at the same time
Powering-off network relay devices
Planned outage of storage systems in a GAD 3DC delta resync environment
Powering off the GAD+UR primary storage system
Powering on the GAD+UR primary storage system
Powering off the GAD secondary storage system
Powering on the GAD secondary storage system
Powering off the UR secondary storage system
Powering on the UR secondary storage system
Powering off the external storage system, I/O at primary site (GAD+UR)
Powering on the external storage system, I/O at primary site (GAD+UR)
Powering off external storage system, I/O at secondary site (GAD+UR)
Powering on external storage system, I/O at secondary site (GAD+UR)
Configurations with TrueCopy
Overview of UR/TC configurations
Sharing volumes with TrueCopy
3DC cascade configuration
Prerequisites for 3DC cascade
Setting up the 3DC cascade configuration
3DC multi-target configuration
Prerequisites for 3DC multi-target
Setting up 3DC multi-target configuration
Delta resync configuration
Additional task for the 3DC multi-target configuration using delta resync
Creating the delta resync pair
Setting up remote command devices for use with CCI
Mapping remote command devices for delta resync operations
Assigning mirrors to remote command devices for delta resync operations
Releasing a remote command device for delta resync operations assigned to a mirror
Relationship between deleted associated pairs and assigned remote command devices
Automatically deleted pairs that are automatically released
Conditions for performing delta resync
Conditions for ending delta resync
When delta resync is not performed successfully
Delta resync failure error prevention
Configurations with ShadowImage
Overview of UR/SI configurations
Configurations with SI primary volumes
Configurations with SI secondary volumes
Pair status and data currency
UR CLI reference
Configuration operations
Pair operations
Monitoring operations
Maintenance operations
Parameter range for CCI options
Consistency group operations

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