Dell EMC Solutions Enabler 9.2 SRDF Family CLI User Guide

The SRDF daemon (storrdfd) provides consistency protection for:

• SRDF/A Multi-Session Consistency (MSC) consistency groups in multi-array environments
• SRDF/S RDF-Enginuity Consistency Assist (ECA) consistency groups in multi-array environments
• Multiple SRDF groups within the same array
• For MSC consistency groups, the SRDF daemon performs cycle switching and cache recovery for all SRDF/A sessions within a consistency group, and manages the R1 -> R2 commits for SRDF/A sessions in multi-cycle mode.

  If a data flow interruption (such as a trip event) occurs, storrdfd:

  • Halts R1->R2 data propagation
  • Analyzes the status of all SRDF/A sessions.
  • Either commits the last cycle of data to the R2 targets or discards it.
• For RDF-ECA consistency groups, storrdfd continuously polls SRDF/S sessions for data flow interruptions.

  If any R1 device is unable to propagate data to its R2 target, storrdfd:

  • Halts all R1->R2 data flow within an RDF-ECA consistency group.

storrdfd ensures that you always have a consistent R2 copy of a database at the point in time in which a data interruption occurs.