Dell EMC Solutions Enabler 9.2 SRDF Family CLI User Guide

Swapping the R1/R2 designation of the SRDF devices can impact the state of your stored data.

The refresh action indicates which device does not hold a valid copy of the data before the swap operation begins. If you determine that the R1 holds the valid copy, the action of -refresh R2 obtains a count of the tracks that are different on the R2 and marks those tracks to refresh from the R1 to the R2 device. The result is the opposite if you specify to -refresh R1 as the option.

• -refresh R1 — The R2 device holds the valid copy and the R1 device's invalid tracks are updated using the R2 data.
• -refresh R2 — The R1 device holds the valid copy and the R2 device's invalid tracks are updated using the R1 data.

Syntax

You can issue the swap command for device groups, composite groups and device files:

symrdf [-g DgName |-cg CgName |-sg SgName |-f FileName] swap
   -refresh {r1 | r2}
   [-v | -noecho]
   [-force]
   [-symforce]
   [-bypass]
   [-noprompt]
   [-i Interval]
   [-c Count]
   [-hop2 | -bcv [-hop2] | -all | -rbcv | -brbcv]
   [-rdfg GrpNum]
   [-sid SID]

Options

-bcv

Targets just the BCV devices associated with the SRDF device group for the swap action.

-all

Target both BCV and standard devices

-hop2

Targets the SRDF action at the group's second-hop devices in a cascaded SRDF relationship.

Use alone (without other options) to target standard devices. Use -bcv -hop2 to target BCV devices.

Example

The following example:

• Swaps the R1 designation of the associated BCV RDF1 devices within device group ProdGrpB.
• Marks to refresh any modified data on the current R1 side of these BCVs from their R2 mirrors:

symrdf -g ProdGrpB -bcv swap -refresh R1