- Notes, cautions, and warnings
- PREFACE
- Revision history
- SRDF CLI overview
- Introduction to SRDF
- SYMCLI for SRDF
- SRDF pair states and links
- Before you begin
- Array access rights
- Device external locks
- SRDF operations and copy sessions
- Mirror R1 to a larger R2 device
- Restrict synchronization
- SRDF software and hardware compression
- Set compression for SRDF
- SRDF/A and the consistency exempt option
- Mixed-mode workloads on an SRDF director
- Set mixed-mode workloads
- FAST VP SRDF coordination
- Basic SRDF Control Operations
- Summary
- SRDF basic control operations
- SRDF modes of operation
- Establish an SRDF pair (full)
- Establish an SRDF pair (incremental)
- Failback to source
- Failover to target
- Invalidate R1 tracks
- Invalidate R2 tracks
- Make R1 ready
- Make R1 not ready
- Make R2 ready
- Make R2 not ready
- Merge track tables
- Move one-half of an SRDF pair
- Move both sides of SRDF device pairs
- Read/write disable target device
- Refresh R1
- Refresh R2
- Restore SRDF pairs (full)
- Restore SRDF pairs (incremental)
- Resume I/O on links
- Split
- Suspend I/O on links
- Swap one-half of an SRDF pair
- Swap SRDF pairs
- Update R1 mirror
- Write disable R1
- Write disable R2
- Write enable R1
- Write enable R2
- Dynamic Operations
- Dynamic operations overview
- Manage SRDF groups
- Device pairing operations
- Create a device file
- Valid device types for SRDF pairs
- Block createpair when R2 is larger than R1
- Creating SRDF device pairs
- symrdf createpair (-file option) syntax
- Create dynamic pairs with -file option
- Create dynamic pairs with the -sg option
- Create pairs with the -establish option
- Create pairs with the -format option
- Create pairs with the -invalidate option
- Create pairs with the -restore option
- Verify host cannot write to target devices with -nowd option
- Create dynamic concurrent pairs
- Deleting dynamic SRDF device pairs
- Group, move and swap dynamic devices
- SRDF/Asynchronous Operations
- SRDF/Asynchronous operations overview
- SRDF/Asynchronous operations
- Transition replication modes
- Set SRDF/A group cycle time, priority, and transmit idle
- Check for R1 invalid tracks
- Consistency for SRDF/A devices
- Add/remove devices with the consistency exempt option
- Adding device pairs to an active SRDF/A session
- Removing device pairs from an active SRDF/A session
- Display checkpoint complete status
- Delta Set Extension management
- DSE SRP capacity management (HYPERMAX OS)
- DSE pool management - Enginuity 5876
- Manage transmit idle
- Manage SRDF/A write pacing
- Devices that cannot be paced in a cascaded SRDF configuration
- Set SRDF/A group-level write pacing attributes
- Activate write pacing
- Simultaneous group-level and device-level write pacing
- Display SRDF/A
- SRDF/Metro Operations
- SRDF/Metro Overview
- SRDF/Metro changes to SYMCLI operations and commands
- Display SRDF/Metro
- Device pairs in SRDF/Metro configurations
- Manage resiliency
- Suspend an SRDF/Metro group
- Deactivate SRDF/Metro (deletepair)
- Example: Setting up SRDF/Metro (Array Witness method)
- SRDF/Metro Smart DR Operations
- SRDF/Metro Smart DR Overview
- SRDF/Metro Smart DR restrictions and dependencies
- SRDF/Metro Smart DR basic control operations
- SRDF/Metro Smart DR changes to SYMCLI operations and commands
- Set up an SRDF/Metro Smart DR environment
- Remove an SRDF/Metro Smart DR environment
- Monitor SRDF/Metro Smart DR
- Control an SRDF/Metro Smart DR environment
- Recover an SRDF/Metro Smart DR environment
- Consistency Group Operations
- Consistency group operations overview
- SRDF consistency group operations
- Enable and disable SRDF consistency protection
- Enable consistency: composite group vs. SRDF group name
- Enabling SRDF consistency protection for concurrent SRDF devices
- Check if device pairs are enabled for consistency protection
- Block symcg enable on R2 side
- Delete an SRDF consistency group
- Suspend SRDF consistency protection
- Composite group cleanup (msc_cleanup)
- Modify consistency groups
- Before you begin consistency group modification
- Consistency group modification restrictions
- Prepare staging area for consistency group modification
- Restrictions: Add devices to SRDF consistency group
- Restrictions: Remove devices from SRDF consistency group
- Restrictions: Device types allowed for add operations to an RDF1 consistency group
- Restrictions: Device types and consistency modes allowed for add operations to a concurrent RDF1 consistency group
- Restrictions: Devices types allowed to add to a cascaded RDF1 consistency group
- Restrictions: Device types allowed for remove operations from an RDF1 consistency group
- Restrictions: Device types allowed for remove operations from a concurrent RDF1 consistency group
- Restrictions: Device types allowed for remove operations from a cascaded RDF1 consistency group
- Recovering from a failed dynamic modify operation
- Consistency groups with a parallel database
- Consistency groups with BCV access at the target site
- Concurrent Operations
- Cascaded Operations
- Cascaded operations overview
- Setting up cascaded SRDF
- R21 device management
- Cascaded SRDF with EDP
- Sample session: planned failover
- Display cascaded SRDF
- SRDF/Star Operations
- SRDF/Star operations overview
- SRDF/Star states and operations
- SRDF/Star operations summary
- Configure and bring up SRDF/Star
- Step 1: Verify SRDF/Star control host connectivity
- Step 2: Verify array settings
- Step 3: Create an SRDF/Star composite group
- Step 4: Create the SRDF/Star options file
- Step 5: Perform the symstar setup operation
- Step 6: Create composite groups on target sites
- Step 7: (Optional) Add BCV devices to the SRDF/Star configuration
- Step 8: Bring up the SRDF/Star configuration
- Displaying the symstar configuration
- Removal of a CG from SRDF/STAR control
- Basic SRDF/Star operations
- SRDF/Star consistency group operations
- Before you begin: SRDF daemon interaction
- SRDF/Star consistency group restrictions
- Prepare staging for SRDF/Star consistency group modification
- Add devices to a concurrent SRDF/Star consistency group
- Add devices to a cascaded SRDF/Star consistency group
- Remove devices from consistency groups
- Recovering from a failed consistency group modification
- Recovery operations: Concurrent SRDF/Star
- Workload switching: Concurrent SRDF/Star
- Planned workload switching: Concurrent SRDF/Star
- Unplanned workload switching: concurrent SRDF/Star
- Unplanned workload switch to synchronous target site: concurrent SRDF/Star
- Unplanned workload switch to asynchronous target site: concurrent SRDF/Star
- Switch back to the original workload site: concurrent SRDF/Star
- Recovery operations: Cascaded SRDF/Star
- Workload switching: Cascaded SRDF/Star
- Reconfiguration operations
- SRDF/Star configuration with R22 devices
- Device Migration Operations
- SRDF/Automated Replication
- SRDF/Automated Replication overview
- SRDF/Automated Replication operations
- Clustered SRDF/AR
- Set symreplicate parameters in the options file
- Manage locked devices
- TimeFinder and SRDF operations
- SRDF Automated Recovery Operations
Dell EMC Solutions Enabler 9.2 SRDF Family CLI User Guide
SRDF/Star operations overview
SRDF/Star deployments include three geographically dispersed data centers in a triangular topology. SRDF/Star protects against a primary site failure or a regional disaster by mirroring production data synchronously to a nearby site and asynchronously to a distant site. This architecture can be expanded to include multiple triangles.
If a failure occurs at the workload site, one target site resumes data replication for the workload site while the other resumes as a protected secondary target site.
SRDF/Star uses dynamic SRDF devices that can function as either an R1 or an R2 device. During failure recovery, the R2 devices at either the synchronous target site or the asynchronous target site are dynamically converted to R1 devices to become production devices at the new workload site.
The basic component of the SRDF/Star configuration is the composite group (CG). Multi-Session Consistency (MSC) or Enginuity Consistency Assist (ECA) technology ensures data consistency, and that all members in the CG are either replicating or not replicating.
NOTE: When running SRDF/Star and MSC, MSC needs to be disabled to remove all Star flags and sessions from a device.
The CG definition can span cascaded and concurrent SRDF configurations (SRDF/A and SRDF/S) across multiple arrays.
NOTE:
SRDF/Star requires a Star control host at the workload site, SRDF/A recovery links, and a Star control host at one of the target sites. A Star control host is a host which is locally attached to only one of the sites in the SRDF/Star triangle and is where the symstar commands are issued.
SRDF/Star topologies include:
- Cascaded SRDF/Star
- Cascaded SRDF/Star with R22 devices
- Concurrent SRDF/Star
- Concurrent SRDF/Star with R22 devices
The following prerequisites exist for the SRDF/STAR topologies:
- SRDF/STAR topologies without R22 devices cannot have any RDF device pairs in the recovery SRDF group.
- The SRDF/STAR topologies with R22 devices must have RDF device pairs configured between all the devices in the recovery SRDF group.
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