How does SRDF a work?
SRDF/A operates in asynchronous mode. It is a disaster-restart solution that mirrors data from the R1 devices while maintaining a dependent-write consistent copy of the data on the R2 devices at all times.
What is SRDF in powermax?
SRDF replicates data between 2, 3, or 4 arrays located in the same room, on the same campus, or thousands of kilometers apart. 684 and Solutions Enabler/Unisphere for VMAX 8.1 introduced support for SRDF/Metro for VMAX3 and VMAX All Flash families of storage arrays.
What is SRDF Lun?
A consistency group is a collection of Symmetrix LUNs that helps in maintaining write consistency during replication. Ensure that EMC Symmetrix Solutions Enabler (version v7.
What is SRDF EMC?
The EMC Symmetrix Remote Data Facility / Asynchronous (SRDF/A) is a key component for disaster recovery with EMC Symmetrix storage arrays. SRDF/A provides the technology necessary to replicate large amounts of data between geographically separated data centers.
What is SRDF group?
All Symmetrix Remote Data Facility (SRDF) operations in PowerHA® SystemMirror® Enterprise Edition clusters are performed on a composite group and not on individual device groups. The composite group that is enabled for consistency is known as the consistency group .
How do I set up SRDF?
How to Configure an EMC SRDF Replication Group
- Verify that the primary and secondary replicas are synchronized.
- Determine which node contains the primary replica and which node contains the secondary replica by using the symdg show command.
- Enable the secondary replica.
- Swap the RDF1 and RDF2 devices.
What is SRDF Metro?
SRDF/Metro is a new feature available on the VMAX3/VMAX All Flash which provides active/active access to the R1 and R2 of an SRDF configuration. In traditional SRDF, R1 devices are Read/Write accessible while R2 devices are Read Only/ Write Disabled.
What is failback in SRDF?
During the SRDF failback operation the R2 devices are write-disabled, the SRDF link is suspended, the disk tracks are then merged, the SRDF link is resumed, then the R1 devices are write-enabled.
How does Smart Dr enhance SRDF metro capabilities?
SRDF/Metro Smart DR
- Disaster Recovery (DR) Solutions protect against failures of the local storage or database by keeping a remote, up-to-date copy of the data.
- SRDF/Metro provides higher database resiliency at short distances (up to approximately 100km), based on synchronous replication.
How does SRDF replication work?
SRDF software replicates data between two, three, or four arrays located in the same room, on the same campus, or thousands of kilometers apart. SRDF replication modes include: SRDF synchronous (SRDF/S)―SRDF/S replication maintains a real-time copy at arrays that are located within 200 kilometers.
What is Delta set in SRDF?
Capture Delta set on Source Array – It captures all incoming writes to all R1s defined in SRDF/A group. Transmit Delta Set on Source Array – It transfers its contents from the source to the remote array.
What is the difference between SRDF and SRDF/A and ACP?
SRDF/ACP is sometimes used to save on hardware cost (less cache memory requirements) and network bandwidth over SRDF/A.
What is the difference between SRDF and SRDF A?
SRDF/A, is asynchronous mode of replication which maintains a near-real-time copy of the data and involves some data loss unlike SRDF (Sync) which maintains a real time copy.The replication happens within a scheduled time gap of may be few minutes to hours as per customer requirements.It involves RPO/RTO.
What is the SRDF I/O service rate correction?
When the SRDF I/O service rates are lower than the host I/O rates, it takes corrective action to slow host I/O rates to match the SRDF I/O service rates. It is a dynamic feature applied at the SRDF group level.
When to use SRDF/DM vs/s or/s/r2?
You should only use this for initial syncing data from source to target since SRDF/DM runs at a lower priority than SRDF/A or /S. But beware: an R2 that’s being sync’d with SRDF/DM is NOT to be used as usable copy. Switch to SRDF/A or SRDF/A when all or almost all data is sync’d to the R2.