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Dell EMC Solutions Enabler 9.2 SRDF Family CLI User Guide

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Add devices to a cascaded SRDF/Star consistency group

Restrictions

The symstar -cg CgName modifycg -add command moves the devices from the staging area to the SRDF group(s).

The following table shows the valid states for adding device pairs to a CG in a cascaded SRDF/Star configuration.

Table 1. Allowable states for adding device pairs to a cascaded CG
State of 1st target site (Synchronous) State of 2nd target site (Asynchronous) STAR state
Connected Connected Unprotected
Protected Connected Unprotected
Protected Protected Unprotected
Protected Protected Protected

Example

The following example shows:

  • CG CasStarCG spans a cascaded SRDF/Star configuration.
  • The 3 arrays are: 306, 311, and 402.
  • The staging area contains devices 20 and 21.
Figure 1. Adding devices to a cascaded SRDF/Star CG

To move devices 20 and 21 from the staging area to SRDF groups 84 and 85 of CasStarCG: 

symstar -cg CasStarCG modifycg -add -sid 306 -stg_rdfg 74 -devs 20:21 -stg_r21_rdfg 75 -cg_rdfg 84 -cg_r21_rdfg 85

The following image shows the configuration after the move:

  • Devices 20 and 21 were added to CasStarCG.
  • The staging area contains empty SRDF groups 74 and 75:
Figure 2. CasStarCG after a dynamic add operation

Pair states of devices in a CG after symstar modifycg -add

The following table shows the pair states of the devices in the SRDF/Star CG after the symstar modifycg -add command completes. These pair states are based on the state of the SRDF/Star site and the SRDF mode of the device pairs in the CG.

Table 2. Pair states of the SRDF devices after symstar modifycg -add completion
State of SRDF/Star sites Mode of device pairs in CG Pair state of devices in CG after symstar modifycg -add Possible delay for symstar modifycg -add command
Connected Adaptive copy disk Synchronized or SyncInProg No delay because command completes when pair is SyncInProg.
Protected SRDF/S Synchronized Completes when devices are synchronized.
SRDF/A Consistent without invalid tracks Completes when the consistency exempt option (-exempt) clears on the devices added to the CG.
Star Protected SRDF/S Synchronized Completes when devices are synchronized.
SRDF/A Consistent without invalid tracks Completes when devices are recoverable.

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