Step by Step Comprehensive Detailed Explanation:
In an SRDF (Symmetrix Remote Data Facility) disaster recovery scenario where production has been switched to the R2 devices at the target site, theResumeoperation allows the primary hosts to regain access to the R1 devices without waiting for a full data transfer from the R2 devices.
Here's how it works:
R1 Access:The Resume operation makes the R1 devices (at the primary site) accessible to the primary hosts.
Background Synchronization:While the hosts access and modify data on the R1 devices, SRDF continues to synchronize the changes from the R2 devices (at the target site) in the background. This ensures that the R1 devices are gradually updated with any changes that occurred on the R2 devices during the failover.
This approach minimizes downtime and allows for a quicker return to the primary site without waiting for a lengthy synchronization process to complete before granting host access.
Why other options are incorrect:
A. Update:This operation copies changes from R2 to R1, but it doesn't necessarily grant immediate host access to R1.
B. Fallback:This is a more comprehensive process that involves reversing replication direction and fully restoring the primary site as the production environment.
C. Failover:This operation switches production to the R2 devices, not the R1 devices.
References and documents of Dell's public documentation for PowerMax Operate v.2:
Dell Solutions Enabler 10.0.0 SRDF Family CLI User Guide:This guide provides detailed information about SRDF commands and operations, including the symrdf resume command. You can find this document on the Dell Support website by searching for "Solutions Enabler SRDF Family CLI User Guide."
Dell PowerMax Family: Essentials and Best Practices Guide:This guide offers a comprehensive overview of SRDF and its functionalities, including disaster recovery scenarios and the use of the "Resume" operation.
