Dell EMC Solutions Enabler 9.2 SRDF Family CLI User Guide

Description

The symstar modifycg command moves devices between the staging area and the SRDF/Star CG, and updates the CG definition.

Syntax

symstar -cg CgName
	  -i Interval 
	  -c Count -noprompt 
	  -v
	  -sid SID
	  -devs SymDevStart:SymDevEnd or
         SymDevName, SymDevStart:SymDevEnd or
         SymDevName... or
   -file FileName}
	  -stg_rdfg GrpNum,GrpNum
	  -cg_rdfg CgGrpNum,CgGrpNum
  	-stg_r21_rdfg GrpNum 
	  -cg_r21_rdfg CgGrpNum
modifycg -add [-force]
modifycg -remove

Options

-devs SymDevStart:SymDevEnd or SymDevName, SymDevStart:SymDevEnd or SymDevName... or -file FileName

Specifies the ranges of devices to add or remove.

-stg_rdfg GrpNum,GrpNum

Indicates the SRDF group(s) comprising the staging area. For a concurrent CG, two groups must be specified, separated by a comma. These SRDF groups are associated with the SRDF groups in the -cg_rdfg option. This association is based on their order in -stg_rdfg and -cg_rdfg.

-cg_rdfg CgGrpNum,CgGrpNum

The SRDF group(s) within the SRDF/Star CG in which to add or remove devices. For a concurrent SRDF/Star CG, two SRDF groups must be specified, separated by a comma. These SRDF groups are associated with the SRDF groups in the -stg_rdfg option. This association is based on their order in -cg_rdfg and -stg_rdfg.

-stg_r21_rdfg GrpNum

The SRDF group comprising the staging area at the R21 array when the configuration is cascaded. It is required for an add or remove operation when the setup is cascaded. This SRDF group is associated with the SRDF group in the -cg_r21_rdfg option.

-cg_r21_rdfg CgGrpNum

The SRDF group connecting the R21 and R2 arrays of a cascaded SRDF/Star CG. It is only valid for operations involving cascaded R1 devices. This SRDF group is associated with the SRDF group specified in the -stg_r21_rdfg option.

Examples

The following example shows:

• CG ConStarCG spans a concurrent SRDF/Star configuration.
• The 3 arrays are: 306, 311, and 402.
• The staging area contains devices 20 and 21.

To add only device 20 from the staging area into SRDF groups 40 and 80 of ConStarCG:

symstar -cg ConStarCG modifycg -add -sid 306 -stg_rdfg 45,85 -devs 20 -cg_rdfg 40,80 

The following image shows ConStarCg after device 20 was added. Note that device 21 is still in the staging area:

Restrictions

• The add operation can only add new device pairs to an existing Star triangle within the SRDF/Star CG. It cannot add a new Star triangle to the SRDF/Star CG.
• If the target of the operation is a concurrent SRDF/Star CG (with or without R22 devices), the devices to be added must be concurrent R1 devices.
• If the target of the operation is a cascaded SRDF/Star CG (with or without R22 devices), the devices to be added must be cascaded R1 devices.
• If the target of the operation is a cascaded SRDF/Star CG (with or without R22 devices) and the devices to be added are cascaded R1 devices with a diskless R21, then the R21 devices in the affected triangle of the SRDF/Star CG must also be diskless.
• If the target of the operation is a cascaded SRDF/Star CG (with or without R22 devices) and the devices to be added are cascaded R1 devices with a non-diskless R21, then the R21 devices in the affected triangle of the SRDF/Star CG must also be non-diskless.
• The following table lists the valid SRDF/Star states for adding device pairs to a CG in a concurrent SRDF/Star configuration.

  Table 1. Allowable SRDF/Star states for adding device pairs to a concurrent CG

  State of 1st target site (Synchronous)	State of 2nd target site (Asynchronous)	STAR state
  Connected	Connected	Unprotected
  Protected	Connected	Unprotected
  Connected	Protected	Unprotected
  Protected	Protected	Unprotected
  Protected	Protected	Protected