Dell EMC Solutions Enabler 9.2 SRDF Family CLI User Guide

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Pair states for migrate -replace for first leg of concurrent SRDF

Figure 1 shows the SRDF pair state required before replacing an R1, the R11 and its existing device.

Figure 2 shows the SRDF pair state required when replacing R2, the R11 and its existing R2 device. For the purpose of this discussion, this is the first leg of the concurrent SRDF relationship for both R1 and R2 migrations.

The following table lists the applicable pair states for symrdf migrate -replace for an R1 and an R2 migration.

Table 1. SRDF migrate -replace control operation and applicable pair states
Control operation:	Pair state: Existing ->R2
Control operation:						¹	²
migrate -replace	P	P	P	P							P

The following image shows a sample concurrent SRDF configuration for an R1 migration:.

Figure 1. R1 migration: R11/R2 applicable pair states for migrate -replace (first leg)

The R11 in array A and the R2 device in array B must be in one of the applicable pair states before issuing the symrdf migrate -replace command.

The following image shows a sample concurrent SRDF configuration for an R2 migration:

Figure 2. R2 migration:R11/R2 applicable pair states for migrate -replace (first leg)

The R11 in array A and the R2 device in array B must be in one of the states before issuing the symrdf migrate -replace command