Dell EMC Solutions Enabler 9.2 SRDF Family CLI User Guide

Create cascaded SRDF/EDP pairs and set mode

Syntax

Use the symrdf createpair command with the -rdf_mode option to create the SRDF pairs for both the first and second hops, and set the SRDF mode.

Use the command twice, once for each hop.

symrdf -file Filename -sid SID -rdfg GrpNum 	
      [-bypass] [-noprompt] [-i Interval] [-c Count]
      [-v|-noecho] [-force] [-symforce] [-star]

    createpair -type <R1|R2>
      <-invalidate <R1|R2> | -establish | -restore>
      [-rdf_mode <sync|acp_wp|acp_disk|async>] 
      [-g NewDg] [-remote]

NOTE:

Adaptive copy write pending mode (acp_wp) is not supported when the R1 side of the RDF pair is on an array running HYPERMAX OS.

In an SRDF/EDP configuration, you cannot bring devices Read Write on the link until the diskless devices are designated as being R21s.

Use the -invalidate R2 option instead of the -establish option.

NOTE:

Since the R21 devices are diskless and cannot be mapped, you do not need to make the device Not Ready or Write Disabled before using the -invalidate R2 option.

In the following example procedure, TestFile1 specifies two device pairs on SIDs 284 and 305:

0380 07A0
0381 07A1

Use the symrdf createpair command to configure the device pairs, SRDF group, and SRDF mode for the first (R1 -> R2) hop:
```
symrdf createpair -file TestFile1 -sid 305 -rdfg 210 -type R2 -invalidate R2 -rdf_mode sync
```
Figure 1. Set up first hop in cascaded SRDF with EDP
The SRDF device pairs are created and placed in synchronous mode.
- TestFile2 specifies two device pairs:
  - 07A0 03A0
  - 07A1 03A1
Use a second symrdf createpair command to configure the device pairs, SRDF group, and SRDF mode for the second (R21 -> R2) hop:
```
symrdf createpair -file TestFile3 -sid 305 -rdfg 230 -type R1 -establish -rdf_mode acp_disk
```
Figure 2. Set up second hop in cascaded SRDF with EDP
Use the symrdf establish command to make the R1 device pairs Read Write in the first (R1->R21) hop on the link.
```
symrdf establish -file TestFile1 -sid 305 -rdfg 210
```

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Dell EMC Solutions Enabler 9.2 SRDF Family CLI User Guide

Create cascaded SRDF/EDP pairs and set mode

Syntax

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